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Welcome to the new Do-It-Yourself / Frequently Asked Questions & Resources Guide!
" The MarkIV Forum Essentials " (under construction...)


In case you're new, this thread is a massive compilation of this forums most essential material.
It will serve as your reference point for common topics & discussion, detailed step-by-step
tutorials, technical information, and other great resources that you'll need during your stay.

For the unadjusted don't worry - the old thread is still there. But I think you'll find this
reorganized and fully reformatted version allows for much better browsing and simpler
searching. With dead links removed and improved content, it also includes a couple
Video DIYs that offer a pleasant alternative to the traditional typed tutorial.

( To submit tutorials, information, suggestions, or errors ... )


-SEARCHING-



While great effort is taken to categorize everything as practically as possible,
keep in mind
many topics cross multiple classifications and may be useful in various scenarios.

If you already know what you're looking for you can search for it by pressing
Control + F.
Can't find it? Try again using a synonymous term, ("door lock" v. "door latch")
or a different variation of the same keyword. ("rearview" vs "rear-view")

Don't forget many DIYs cover removal & re-installation of a whole series of parts,

so if you don't see a specific link to say, remove the a-pillar trim,
remember that is a procedure found in the headliner remove & reinstall how-to.

Last but not least, visit the MarkIV sister forums: The 3/2/G and .:R32 Forum,

in addition to the Technical Forums for further discussion & information
on everything from bodywork through lighting to engine & transmission tech.


-SECTIONS-

NEW! The Cheap Mods Thread (all about $100 Mods)


General / FAQ

1.8T
2.0L
TDI
VR6

Exterior
Exterior Lighting
Interior
Interior Electronics & Accessories

Drivetrain
Transmission

Intake & Exhaust

Brakes
Suspension
Wheels & Tires

On Board Diagnostics (OBD-II)


-RECENT ADDITIONS-


DIY: Key Remote Dissection
DIY: Key Remote Window Operation
DIY: Fog Lights, TMTuning 70mm LED Fogs: Installation
DIY: Seafoam Motor Treatment
DIY: A Guide to RHD Swap

-DISCLAIMER-


Always remember the content of this thread is contributed by enthusiast not experts
and that your most reliable source is a trained and certified professional.

 

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[ GENERAL / FAQ ]


General

Mark4 Service Interval Check List - for all engines: What gets done by the dealer when schedules maintenance is performed.

Fuse Listings

Major Recall List - major recalls, window regulators, coilpacks, mafs, o2 sensors, heated seats, brake light switch, abs controller, etc.

4-Door 1.8T Golf Production Figures

Common Topics & FAQ

The Registry List - want to find pictures of a specific color of car? want to find others who own your color or model? links to all the "registry" threads.

The '1.8T vs VR6' Thread

Differences Between GLI's - differences between the 2002-2004 200hp 24v VR6 GLI and the 2004.5+ 180hp 1.8T GLI.

Everything You Need to Know: Winter Storage - storing your car for the winter or otherwise long period of time? read this.

DIY / How-To / Technical

How: Key Remote Battery Replacement - how to open the key fob/remote and replace the battery

How; Properly Jack Up Your Vehicle - jack points, jackstands, safety.

How: Start Your Car - just in case.
 

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[ 1.8T ENGINES ]


Resources & Discussion

1.8T Technical Forum - forum for discussion and topics related specifically to the 1.8t engine.
1.8T Technical DIY/FAQ - a more comprehensive compilation of frequently asked questions, diy's, how-to's, and technical information related to the 1.8t.
Engine Codes & Statistics - explains the various engine codes and differences between them: compression, stock boost values, power output, etc.

Mark4 Coilpack / Ignition Coil Guide
1.8T Cold Start Noises

Idiots Guide to Basic Modding the 1.8T - by SoCalDubber
Stock Turbo Tuning Guide - by SAVwKO

1.8T Chip Tuning Guide - everything you wanted to know about 1.8t chips
Official "What Chip to Buy" Thread - *2005 / poll results missing*
BOV vs. DV - why replacing your diverter valve with a blow-off valve may not be the best idea.
Cranked Wastegate - discussion and explanation of cranking the wastegate to squeeze out additional hp at the risk of damaging your turbo


DIY / How-To / Technical

How: 1.8T Oil & Filter Change

DIY: Alternator Replacement

DIY: Coolant Temp (ECT) Sender Replacement - change to the new green top coolant sensor.

DIY: Clamping the MAP Sensor ("Diode Mod") - how to clamp your MAP sensor for increased performance.

DIY: Diverter Valve Replacement - how to install a new diverter valve. *dead pics*
DIY: Diverter Valve Maintenance - how to maintain a piston style diverter valve, applicable to most brands. *dead pics*
DIY: Wastegate Actuator (N75) Valve Swap - how to swap N75 valves. *dead pics*

DIY: Ignition Coil & Spark Plug Replacement - how to replace the ignition coils and/or spark plugs
How: "Read" Your Spark Plugs - pictures showing various types of damage to spark plugs.
DIY: Ignition Coil Wiring First Aid - repair a cracked ignition coil wiring harness with seal-all
DIY: Ignition Coil Wiring Harness Replacement -
DIY: Ignition Coil Wiring Wrap - prevent the ignition coil harness from cracking by installing an OEM heatshield from the Audi TT.

DIY: Intercooler Clean and De-Oil -
DIY: Intercooler (Front Mount) Modification & Install - how to modify an advan racing fmic from eBay for use with the 1.8T.
DIY: Intercooler Vent Mod - how to make a vented fender liner to increase flow to a side mount intercooler.

DIY: Powergasket Install - how to install a newsouth performance powergasket.

DIY: Timing Belt &/ Water Pump Replacement - the ultimate 1.8t timing belt replacement how to.

DIY: Turbo Inlet Pipe Replacement - how to install an upgraded (Neuspeed) turbo inlet pipe.
DIY: Turbo Inlet Hose Install for K04-20 - how to upgrade the stock unit for a silicon replacement. for vehicles equipped with a K04 turbo.
DIY: Turbo Upgrade - K04-20 - upgrade your turbo with OEM parts from an Audi TT-225.

DIY: Turbo Timer Installation - how to install a Greddy turbo timer in a 2001 Jetta.
DIY: Turbo Timer w/ Companion Install - how to install a blitz turbo timer and companion.
How-to: Greddy Turbo Timer Installation Notes

DIY: Underdrive Pulley Install - how to install a eurosport underdrive pulley kit (applicable to other brands).

DIY: Valve Cover Removal & Gasket Replacement

DIY: Water-Methanol Injection Kit Install
 

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[ 2.0L ENGINE ]


Resources & Discussion

2.0L Engine Forum - forum for discussion and topics related specifically to the 2.0L engine.
2.0L Engine DIY/FAQ - a more comprehensive compilation of frequently asked questions, diy's, how-to's, and technical information related to the 2.0L engine.

Budget Modding the MKIV 2.0L - by jwrony
2.0L Tuning Guide - by Uber Ghetto

Oil Consumption (1) - does your 2.0 burn oil? does it constantly need to be topped up?
Oil Consumption (2) - more discussion on the oil consumption issue.


DIY / How-To / Technical

DIY: Camshaft Replacement - how to install TT260 camshaft. may be used for stock or other aftermarket camshafts as well. *Dead pics*

DIY: Oil Dipstick Tube Replacement - how to replace the oil dipstick tube which is prone to cracking. can be used as a guide for all engines. *Dead pics*
DIY: Oil Pan Replacement - how to remove/reinstall/replace the oil pan.

DIY: Spark Plug Replacement - how to replace the spark plugs.
How: "Read" Your Spark Plugs - pictures showing various types of damage to spark plugs.
DIY: Spark Plug Wire(s) Replacement - how to replace one or all of the spark plug wires. *Dead pics*

DIY: TDI thermostat in a 2.0L - how to install a less expensive thermostat from the TDI on a 2.0L *Dead pics*

DIY: Timing Belt & Water Pump Replacement - How to replace your timing belt in a 2.0 AEG *Dead pics*
DIY: Underdrive Pulley Kit Install - how to install a Eurosport underdrive pulley on a 1.8T or 2.0L engine. may be used for other aftermarket parts.
 

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[ TDI ENGINES ]


Resources & Discussion

TDI and Diesel Forum - discussion of all diesel related modifications, installs, maintenance and issues.

TDI Chips


DIY / How-To / Technical

DIY: Injection Pump Replacement on 1.9L ALH

DIY: Timing Belt Inspection - Proper inspection of the timing belt on your TDI
DIY: Timing Belt Replacement - How to replace the timing belt on your TDI

Glow Plug Replacement - How to replace the glow plugs on your TDI

Turbo Removal and Replacement - How to remove and replace the turbo on your ALH TDI (BEW engine is similar)
 

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[ VR6 ENGINES ]


Resources & Discussion

12v VR6 Engine Forum
12v VR6 DIY/FAQ

24v VR6 Engine Forum
24v VR6 DIY/FAQ

Mark4 Coilpack Guide - learn about the coilpack problem. (12v's and 24v's use different systems)

DIY / How-To / Technical
Many components on these engines are the same, so many of the how-tos apply to both even though they are written from the perspective of one.

Tech: VgRt6's Master VR6 Guide - master list of above maintenance procedures and more.

DIY: Alternator Replacement (1)
DIY: Alternator Replacement (2)
DIY: Alternator Wiring Cable Replacement

DIY: Camshaft Install [12v] - Cam shaft install, very basic instructions.

Tech: Coilpack [12v] Testing & Diagnosing - how to test a 12v coilpack.
DIY: Coilpack [12v] Replacement: Aftermarket Alternatives - replace your coilpack with an MSD setup and a little ingenuity.
DIY: Coilpack [12v] Repair (1) - how to fix a coilpack for cheap. (this method will not work with 24v's).
DIY: Coilpack [12v] Repair (2)

DIY: Compression Test [12v] - how to test for cylinder compression on a 12v.

DIY: Coolant Distributor "Crack Pipe" & Thermostat Housing Replacement - often responsible for a coolant leak near front driverside corner of engine
DIY: Coolant Temperature (ECT) Sender Replacement - how to change to the new green top coolant sensor.

DIY: Engine Bay Fuel Line Replacement (1) -
DIY: Engine Bay Fuel Line Replacement (2) - same link as alternator diy above

Tech: Grounding Locations (12v) - locations for connection points if installing a grounding kit.

DIY: Intake Manifold Rotary Change-over Valve "Shifter Rod" Replacement

DIY: 2.0 MAF sensor in VR6 housing - use the cheaper 2.0 MAF sensor in your VR6.
Tech: 2.0 vs VR6 MAF Sensor Innards Comparison

DIY: Oil & Filter Change (1) - how to change your oil correctly.
DIY: Oil & Filter Change (2) - *text only
DIY: Oil Pan Replacement - how to replace a leaking, cracked, or busted oil pan.

DIY: Oxygen (O2) Sensor Replacement - driving for an extended period with a bad MAF will often kill your O2 sensor(s).

DIY: Serpentine Belt Tensioner Replacement & Bearing Lubrication - the tensioner is known to be the cause of engine compartment noise.

DIY: 12v Spark Plugs and Wires - changing spark plugs and wires on a 12v (not applicable to 24v's).
How: "Read" Your Spark Plugs - pictures showing various types of damage to spark plugs.

DIY: Throttle Body Removal & Cleaning

DIY: Timing Chains, Tensioners, and Guides [12v] - should be done around 100k miles.
Tech: Sound Clip of Timing Chain Noise - learn to diagnose the chains.
Tech: Pictures of Worn Timing Chain Parts - see what happens when they start to fail.

DIY: Water Pump Replacement - how to replace the main water pump.



DIY: 12V VR6 Grounding Kit - Engine bay grounding *Dead pics*
 

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[ EXTERIOR ]


Resources & Discussion

The Bodywork Body Styling, & Body Kits Forum - general discussion of bodykits, exterior styling, bodywork techniques, products, and methods.
FAQ: Paint / Prep / Filling / Molding - specifically for the Mark4 commonly touched up areas.

Mark4 Paint Codes 1999.5 to 2004 - oem paint codes for most mk4's.

Everything You Need to Know: OEM Front Bumpers - a list of the different types of bumpers available from the factory and what fits what. also covers rubstrip compatibility.
Everything You Need to Know: Front End Conversions - exploit vw's platform sharing by swapping front ends to get a 'getta', 'jolf', or 'jti'.

OEM Body Kit Part Numbers - part numbers for 337/20AE/gli/r32/rline body kit pieces.
Custom Boser Hood Gallery
Jetta Body Kits - *dated, no pics
Jetta Aftermarket Grilles
Jetta Rear Window Spoilers
Golf/GTI Front Bumper Options - large list of available oem and aftermarket front bumpers/skins/lips for the golf/gti.
The Side Skirt Thread - side skirt options for the mk4. pretty much all skirts will fit both golf/gti and jetta). *dated, no pics

Roof Rack Thread All you ever wanted to know about roof racks for MKIVs.

Shaved & Tucked Engine Bays - pictures and discussion

Everything You Need to Know: Window Regulators - did your window drop into the door and not roll up? is it making grinding noises?
Window Regulator Warranty Extension by VW - information regarding a warranty extension on window regulator for mark4 vehicles.


DIY / How-To / Technical

- Emblems / Badges -


How: Remove "Debadge" Badges / Emblems
How: Restore Finish of Surface Under Emblems after Debaging
DIY: Rear VW Badge Removal & Restoration - removal, dissasembly, painting. applicable to golf/gti.

- Grills -

DIY: Home-made Badgeless Grill (non-sag!) - make your own badgeless grill using oem parts that won't sag. done on a golf/gti but same method would work on a jetta.
DIY: Saggy Bonrath Badgeless Grill Fix

- Bumpers -

DIY: Front Bumper &/ Grill Removal (1) w/ *Video* - how to remove your front bumper and grill
DIY: Front Bumper &/ Grill Removal (2)
DIY: Front Bumper &/ Grill Removal (3) *text only*
DIY: Rear Bumper Removal - how to remove your rear bumper, Golf/ GTI and Jetta.

- Sideskirts -

DIY: Sideskirt Install - *text only - done with oem sideskirts, but process can be used for ANY sideskirt.

- Sunroof & Sunshade -

Tech: Sunroof Drain Locations - have a water leak? water ingress.
DIY: Front Sunroof Drain Hose Replacement - how to repair rear sunroof drains that are leaking water into the interior of the vehicle.
DIY: Rear Sunroof Drain Hose Replacement
DIY: Sunshade Slides / Clips - problems with the sunroof closing? is it hard to push back your sunshade?

- Valances / Lips -

How: Paint Stock / Factory Valances - how to color match your factory lower valances.
How: Fit a GLI Front Lip to a GTi/Golf Euro Bumper - much easier than fitting it to a na bumper (requires cutting/molding)
DIY: Stock Rear Valance Exhaust Modification - how to modify your stock/factory rear valance for later style non-turndown exhaust tips.

- Windows -

DIY: Window Clip Replacement - window fall into the door? need to replace your regulator clips? good for door latch too.
DIY: Window Regulator Repair - how to fix them yourself.

- Wipers -


DIY - Removing the windshield cowl - and fixing noisy / squeaky wipers
How: Replace Aero Wiper Blades - how to replace the blades on your aero wipers less expensively.
DIY: Mono-Wiper Conversion - attain the dtm look with a single front wiper.
DIY: Wiper Linkage Repair - fix your slow/dead front wipers.
DIY Rear Wiper Removal / Delete - how to youremover rear wiper for that clean look
How: Audi Avant Rear Wiper w/ Rotating Sprayer Retrofit - retrofit an audi wagon rear wiper to your hatchback and make the rotating sprayer function work.

- Other -

Blacking out B-Pillars How to black out the b pillar section between the front and rear side windows.
Shaved Jetta trunk DIY - courtesy of tscbmxer92
DIY: Brushed Aluminum-Look Mirrors
3M Clear Bra Protective Strips for Roof Rack feet Protect the area where your roof rack feet sit on the roof
DIY: Audi TT Jack Pad Install
DIY: Hidden Hitch Install - model #60963
 

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[ EXTERIOR LIGHTING ]


Resources & Discussion

The Lighting Forum - discussion of general lighting issues, trends, products, and reviews (not MKIV Specific)
The Lighting DIY/FAQ

MarkIV Bulb Parts List

Everything You Need to Know: Euroswitches

Taillight Options for Golf/GTI - collection of OEM and aftermarket Golf/GTI Tails.
Taillight Options for Jetta (Sedan) - collection of OEM and aftermarket Jetta tails.

Swapping Amber & Clear Parking Light / Signal Lenses
OEM VW Fender Marker Part #s - compiled by diive4sho.
Part Number for VW Repair Wire Needed for rear and front fog installs, 5 brake light mod, etc.


DIY / How-To / Technical

- DRLs -

DIY: Disable DRLs - how to disable you daytime running lights
DIY: DRLs as Parking Lights (1) - how to wire your stock headlights to use the turn signals as DRLs instead of main lights.
DIY: DRLs as Parking Lights (2) -
DIY: DRLs as City Lights - how to wire up your city lights to act as your daytime running lights.

- Fog Lights -

DIY: Fog Lights, OEM: Retrofit Wiring (1) - how to wire up headlamp-integrated fog lights on a vehicle that was not originally equipped with them
DIY: Fog Lights, OEM: Retrofit Wiring (2)
DIY: Fog Lights, OEM: Retrofit Wiring (3)

DIY: Fog Lights, Hella DE: Installation - how to install a hella de fog light kit into lower grilles; discusses basic relay function and wiring.
DIY: Fog Lights, TMTuning 70mm LED Fogs: Installation - review, install, wiring, & bracket making. discussion here.
DIY: Fog Lights, Aftermarket: Euroswitch Wiring - how to wire aftermarket fog lights to a euroswitch; useful for any foglight install.
How: Fog Lights Illuminated w/ High Beams - by tim00jti

How: Aftermarket Fog Light Switch Wiring Fix - how to reverse a manufacturers defect on many aftermarket light switches that causes the fogs to be inop.

DIY: Rear Fog Light Wiring (.pdf) - how to wire up a european style rear fog light.
DIY: Rear Fog Light and 5-brake light wiring for Jetta - enables 5 brakes lights when brakes are applied or just the activation of the rear fog light.
How: Rear Fog Icon in Instrument Cluster Wiring - br

- Headlights -

DIY: Headlight Bulb Replacement - discusses replacing all the bulbs in your headlight. Shown on a Jetta, Golf/GTI is the exact same but different bulbs.
DIY: Headlight Beam Adjustment - general how-to on adjusting / aiming / aligning the headlight beam.
DIY: Parking / Turn Signal Bulb Replacement
How: Jetta Low Beams w/ High beams - how to jumper your lights so that your low beams stay on with your high beams.

DIY: Audi LED-DRL Style Headlights
How: Depo Angel Eye Headlights Wiring
DIY: Helix OEM HID Replicas for Jetta

DIY: Headlight Assembly Removal - how to remove the front bumper in order to remove the headlights
DIY: Headlight Lens Polishing (1) - by ocdpvw
DIY: Headlight Lens Polishing (2) - by FaelinGL
DIY: Painting "Joey Mod" Headlights - how to black out your headlights (or paint them any other color you wish). For Jettas and Golfs/GTIs

- HIDs -

How: OEM HID Harness Assembly - make your own harness adapter for the installation of OEM HIDs with leveling motors. Applicable to jettas and golfs/gti's.
How: OEM HID Auto Leveling - installion of automatic headlight leveling motors and sensors.
How: OEM HID Leveling Motor Wiring How to wire up the OEM HID leveling motors. Applicable to Jettas and Golfs/GTIs.
How: OEM HID Rheostat (Leveling Switch) Wiring - install the manual leveling switch in your oem hid's w/ leveling motors. jetta and gti.

DIY: HIDs Install Instructions - without the crap.

How: Jetta Retrofit HID Guide
DIY: Retro HIDs (1) - how to make your own customer retrofit HID headlights
DIY: Retro HIDs (2) - by Mcbee

- Tail lights -

How: Golf/GTI Tailight Removal - how to remove your rear taillights.
DIY: LED Tailights - convert your existing tails to LED's.
DIY: Tailight Tinting - general procedures for tinting your own tailights.

- Side Marker & Repeaters -

DIY: Side Marker (Bumper) Light Replacement *Video* - how to remove your sidemarkers. applies to all Mark4's.
DIY: Side Repeater (Fender) Light Removal *Video* - how to remove your turn signal repeaters. applies to all Mark4's.
DIY: LED Side (Fender) Repeaters - convert your fender repeaters.

- Other -

DIY: Comfort Turn (Triple Flash) Module - retrofit a komfortblinker like the mk5 & audi into your mark4.
DIY: Reverse Light Switch Replacement - how to replace a malfunctioning reverse light switch.
DIY: Trunk Harness Repair - license plate lights not working?
 

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[ INTERIOR ]


Resources & Discussion

Interior Forum - discussion of general interior issues, seating, lighting, materials, products, etc.

Everything You Need to Know: Instrument Clusters - everything regarding instrument clusters, mfa, fis, european clusters, etc. see below for diy.

Rear Seat Delete &/ Custom Trunk Setups


DIY / How-To / Technical


DIY: Armrest Delete - replace your front arm rest with the GL coin pocket.
DIY: Armrest Support Play Repair - fix your floppy armrest.

DIY: Brushed Aluminum Door Sills - inexpensive do-it-yourself door sills.
DIY: Brushed Aluminum Door Handles

DIY: Cabin "Pollen" Filter Replacement - how to replace the cabin filter, recommended every 40k miles.

How: Center Console Upgrade - upgrade your center console to the late-style with cupholders.

DIY: Dash Vent Upgrade - swap to jetta vents for a cleaner look.

Tech: OEM Black Headliner Part & Pictures - part numbers for OEM black interior trim
DIY: Headliner in a Can Mod - by jkrew
DIY: Headliner Rewrap

DIY: Interior Carpet & Headliner Removal - full interior color change. includes rearview mirror.
DIY: Interior Console Parts Removal, pt. 1 - e-brake & center console, armrest, glovebox, ashtrays
DIY: Interior Dash Parts Removal, pt. 2 - dash trim, brake light switch, radio, cupholder, radio/hvac cage
DIY: Interior Door (front) Parts Removal, pt. 3 - front door panel, door unlock handle, and sideview mirror
DIY: Interior Door (rear) Parts Removal, pt. 4 - rear door panel, door unlock handle and rusty triangle window insert (Alternative link)
DIY: Interior Door Lock Pin Replacement - how to remove and install the interior door lock pins.
DIY: Interior "Deck Lid" / Parcel Shelf Removal - applies to jettas only. allows access to third brake light.
Tech: Interior Trim Part #'s - add OEM wood, metal, Carbon fiber, etc. interior trim to your car.
DIY: Interior Trim Upgrade (1) - how to install a brushed aluminum trim kit.
DIY: Interior Trim Upgrade (2) - installing trim kits, door pins, door lock led's, and footwell lighting.
DIY: Interior Trim Painting
DIY: Door Card Reupholstering - how to recover your door cards with whatever fabric you want.


DIY: Door Lock Module Removal - how to remove the door latch in order to dissect it.
DIY: Door Lock Module Dissection & Replacement - if you have problems with door locks, alarm arming, etc. your door lock module could be at fault.

DIY: Floor Mat Anchor/Clip Swap

DIY: Gauge / Instrument Cluster Aluminum Ring Install - add aluminum rings to your gauge cluster
DIY: Gauge / Instrument Cluster Surround Painting
DIY: Gauge / Instrument Cluster FIS Upgrade - how to install the European Sport FIS cluster in a car that previously had an MFA.
DIY: Gauge Install: A-Pillar Pod
DIY: Gauge Install: Boost Vacuum
DIY: Gauge Install: Overhead Console Pod

DIY: Glove Box Door Replacement - if your glovebox door hinge is broken, this is for you.
DIY: Glove Box Hinge Repair Guide - how to repair that broken glove box hinge.
Tech: Glove Box Differences by Model Year (1) - vw improved the design of the glovebox while also improving its capacity for late production models.
Tech: Glove Box Differences by Model Year (2) - part number and lighting issues addressed).

DIY: Peeling Trim Coating Fix (1) - deal with peeling rubber coating on door handles and pulls.
DIY: Peeling Trim Coating Fix (2)

DIY: Front & Rear Seat Removal
DIY: Front & Rear Seat Cleaning
DIY: Front Heated Seat Retrofit - Install heating elements to non-factory heated seats

DIY: Shift Knob Install - install a reiger illuminated shiftknob
DIY: Shift Knob & SCR Adapter Install - how to install a momo shift know and SCR adapter. Also details hoe to remove your stock shift knob (manual tranny).
How: OEM Shift Knob on an In-Car Short Shifter - how to put an oem shiftknob on an in-car short shifter such as the b&m kit.
How: Shift Boot on an Automatic Shifter - make your auto look like a manual.

DIY: Steering Wheel Removal - process for removing any oem steering wheel.
DIY: Steering Wheel & Wiper/Turn-signal Stalk Removal - how to remove the steering wheel and/or control stalks.

DIY: Aftermarket Corbeau Seat Install and Customization

Tech: Sunroof Drain Locations - have a water leak? water ingress. see exterior section for repairs.
DIY: Sunshade Slides / Clips - problems with the sunroof closing? is it hard to push back your sunshade?

DIY: Sunvisor Airbag Decal Removal
How: Sunvisor Clip Removal - useful for when you are removing the headliner.

DIY: Squeaky Door Seal Fix Fix your squeaky door seals.
How: Squeaks and Rattles Solutions - discuss solutions to interior squeaks and rattles.

DIY: Trunk Hook Install - install the shopping bag hook in the trunk that comes on new vw/audi models.

- DIY: Audi TT (non Dead) Pedal Install

Seat Upholstery DIY – DIY: Custom seat upholstery and disassembly
 

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[ INTERIOR ELECTRONICS & ACCESSORIES ]


Resources & Discussion

Car Audio and Electronics Forum - general discussion of all car audio, video, and electronics products, issues, installs, and trends.
Portable MP3 and Satellite Radio OEM Integration Forum

Camera Mounts - want to shoot cool videos? You'll need one of these.


DIY / How-To / Technical

-Alarm-

DIY: Alarm Horn Disable
DIY: Alarm Horn Upgrade - change the horn and sound using this DIY.
DIY: Alarm Motion Sensor Enhancement
DIY: Alarm LED Indicators on Both Doors - add an alarm LED to the passenger door as well as the driver door, also deals with changing LED colors. *dead pics*
DIY: Radio (Single-Din) Upgrade - questions about installing a Blaupunkt headunit, can be useful for other aftermarket units and double-dins as well.
DIY: Radio (Double-Din) Wiring Fix - does your double din (~2002.5+) headunit sound bad? many were incorrectly wired from the factory.
How: Remove a Stuck CD - procedure for removing and disassembling the headunit in response to cdp error 1&3 / stuck cd.
How: Antenna Base Replacement - this requires dropping the headliner, which is covered in this discussion.
DIY: iPod Install

DIY: Door Speaker Upgrade (1) - replacing your stock speakers with aftermarket units.
DIY: Door Speaker Upgrade (2)
DIY: Subwoofer &/ Amplifier Install - installing a sub and/or an amplifier onto a double-din system. can also be useful for single din/non-monsoon systems.
DIY: Fiberglass sub enclosure made easy DIY that explains how to build a fiberglass subwoofer enclosure for you trunk.

-Horn-

DIY: Hella Horn Install (1)
DIY: Hella Horn Install (2)

DIY: DWA Siren Upgrade – Upgrading the stock alarm to a euro DWA siren

-Key-

Tech: Key Remote Replacement & Programming Guide - what you need to know about replacing a keyfob (remote).
How: Key Remote Programming

How: Key Remote Battery Replacement (1)
How: Key Remote Battery Replacement (2)
DIY: Key Remote Dissection - swap the innards of your keyfob to a new shell. complete disassembly
DIY: Key Remote Retro Swap - swap your early model key for a later model
DIY: Key Remote Transponder Swap

DIY: Key Remote Window Operation - how to open & close your windows with your keyfob
DIY: Alientech Install Guide - add a circuit board that leverages the built in features of you car to roll up and down the windows with the remote.
DIY: Key Remote Range Enhancement - how to increase the range of the remote

DIY: Key Remote Chain Loop Fix - how to re-affix the remote to your key chain if it breaks.
DIY: Key Remote 'Turbo' Emblem Mod - add a turbo emblem to your keyfob.

**Ignition Switch Replacement DIY**
-Lighting-

DIY: Dome Light LED Upgrade - install LED's in all the interior dome lights.
DIY: Footwell Lighting: Neon
DIY: HVAC Bulb Replacement - if your heating, vent, and air conditioning panel doesn't light up anymore.
DIY: Sunvisor/Vanity Mirror Light Replacement - removal and replacement of bulb.

DIY: W8 Overhead Console Install - parts, installation, wiring, faq. additional info here.
DIY: W8-'Style' Overhead Console Lighting - get W8 lighting without spending the money on a new overhead console.
DIY: OEM Overhead Console LED Upgrade - add LEDs to your existing overhead console for a W8 console look without the W8 console price.

DIY: Trunk Lighting Upgrade: Cold Cathode
DIY: Trunk Lighting Upgrade: Neon - add neon lighting to your trunk (procedure can be applied to Golfs/GTIs).

DIY Cup holder rings – LED rings in the center console cup holders

-Wiring-

How: Interior Hardwiring - how to hardwire anything inside the car. gauges, lights, boost pressure. also includes wire routing through the firewall.
How: Route Wires Through the Firewall/Cowl - need to run power wires for an amp This shows you a good path for getting through the firewall.
How: Tach / RPM Signal Tap - finding the tach signal wire for turbo timer, tachometer, and other electronic devices that need it.

Tech: Heated Seat Retrofit Wiring Diagram
DIY: Heated Seat Temperature Sensor Repair - how to fix a likely problem in the heated seat system.
How: Safely Work on Airbag Wiring - removing front seats and side airbag issues.
Tech: Seats & Airbags: Resistors - proper resistors to wire into the front airbag harnesses when using aftermarket seats to take care of the airbag warning light.
Tech: Seats & Airbags: Part #'s and Connectors - for swapping newer seats in older cars
Tech: Seats & Airbags: Wiring Swap for In-Seat Airbag

DIY Built in USB Charging Ports – How to add USB ports for phone charging cleanly


-Clusters-

DIY: Inverting Odometer and Clock Displays
'LED Project #2' - incredible diy for adding LEDs to the speedo and tach that sweep with the gauge needles
DIY Audi bulb monitoring system in a MKIV!

-Other-

DIY: B5 Mirror Switch Swap - install a passat mirror switch in your MKIV.
DIY: Hatch Actuator Replacement - for golfs/gti's
DIY: HomeLink Retrofit - wire up a HomeLink device (garage door opener) with a custom install.
DIY: Push Button Engine Start - add push button ignition to your Mark4.
DIY: Radar Detector Hardwire - how to hard wire a radar detector into your car.
DIY: Trunk Latch / Microswitch Replacement

Tech: Comfort Control Module (CCM) Location - how to get to the ccm which controls many of the interior functions of the car.
Tech: HVAC to Climatronic Upgrade - discussion and feasibility of installing automatic climate control.
Tech: Turn Signals Stuck On? - investigate a wiring fix to correct constant on turn signals after using the remote to lock/unlock doors.

DIY: Passat B5 mirror switch in a MK4 – Installing a D-pad mirror switch from a B5 passat
 

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[ DRIVETRAIN ]


Resources & Discussion

The Engine Thread - in depth engine specs, performance ratings, comparisons, stock dyno plots, etc.
Synthetic Oil, Sludging, & Additves
List of VW 502.00 & 505.01 Approved Oils

Mark4 Coil Pack Guide
Mark4 Spark Plug Specifications - need to know the type of spark plug, gap spec and torque value for your engine?

Low Coolant & Cold Temperatures - low coolant level warning in the winter? read this.

Everything You Need To Know: Engine Swaps
FAQ: ASR/ESP Light


DIY / How-To / Technical

DIY: Optima Battery Upgrade - *dead pics
DIY: Lightweight Battery Install

DIY: Seafoam Motor Treatment

DIY: Oil Catch Can Install

DIY: Fuel Filter Replacment - all gas engines.
DIY: Fuel Level Sending Unit Replacement
DIY: Fuel Line / Connector Repair &/ Replacement -
DIY: Fuel Pressure Regulator Replacement
DIY: Fuel Pump Replacement - all gas engines. *dead pics

DIY: Engine Wiring Tuck / Cleaning
How: Polish Engine Parts - how to polish your intake manifold as well as other engine components.

DIY: ASR Defeat - modify the switch to automatically keep asr off when you turn on the car
DIY: Front End / Clip Removal & Setting the Lock Carrier to the Service Position
DIY: Starter Motor Repair &/ Replacement - how to replace and/or fix a grinding starter. 6-speed a little different, but much the same process.

- - - -

DIY: Axle Replacement - also can be used for CV/CV Boot Replacement (axle needs to come out).
DIY: Passenger Axle Replacement - how to remove the passenger axle without pulling the spindle
DIY: CV Boot Replacement and Joint Inspection

DIY: Left Engine (Trans) Mount &/ Bushing Replacement
DIY: Rear Engine (Dogbone) Mount &/ Bushing Replacement
DIY: VF Engine (Dogbone)Mount Installl
Tech: Aftermarket Dogbone Durometer Comparison

DIY: Tie Rod Replacement - how to replace a tie rod assembly
How: Tie Rod Replacement Tool - make your own handy tool for easily removing and installing tie rods on your car

DIY: Front Wheel Bearing & Hub Replacement
DIY: Rear Wheel Bearing & Hub Replacement (1) - how to replace the rear wheel bearing and hub
DIY: Rear Wheel Bearing & Hub Replacement (2) - *text only
DIY: Rear Wheel Bearing & Hub Replacement (3) *Video* - how to tutorial on diagnosing and replacing a defective rear wheel bearing
 

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[ TRANSMISSION ]


Resources & Discussion

Manual Transmission Forum - general dicussion of vw manual transmission including troubleshooting, gearing, differences, rebuilding, and operation (includes clutch).
Automatic Transmission Forum - general dicussion of vw automatic transmissions including troubleshooting, gearing, differences, and operation. ever wonder how a torque converter works?

Driving Stick 101 - never driven a manual before? get advice and tips here.
Downshifting Debate - downshifting and staying in gear when coming to a stop versus coasting.
Double Clutching & Synchromesh - what are synchros and how do they take the place of 'double clutching'?
Clutch FD& Launch - discusses proper launching techniques for drag racing

VW Transmissions, Synchros, & Short Shift Kits - do you have gear grind or trouble shifting into a certain gear in a manual transmission?
Second Gear Grind- fix that grind when going into second gear on your manual trans.


DIY / How-To / Technical

DIY: Manual Transmission Removal & Clutch Replacement - this one has everything you'll need
DIY: Manual Transmission Removal + Clutch & Flywheel Replacement (2) - done on a 12v 5spd
DIY: Manual Transmission Removal & Clutch Replacement - 00' GTi VR - *text only
Tech: 6-speed Conversion -

DIY: Transmission Fluid Change for 6 Speed O2M
DIY: Changing Manual Transmission Fluid

DIY: Dieselgeek Sigma 5 Shifter Install - includes a great explanation of shift linkage adjustment
DIY: Shift Linkage Adjustment - how to adjust
DIY: Short Shifter Install - install guide that can be used for pretty much every short shifter out there. "pin type" cable ends, earlier cars slightly different.
 

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[ INTAKE & EXHAUST ]


Resources & Discussion

Cold Air Intakes 101 - an introduction to CAI systems: what they are, which one you should buy / comparisons, the benefits, the downsides, hydrolock

Stock Exhaust Sizes: 1.8T / TDI / VR6's = 55mm, 2.0L = 50mm
Aftermarket Exhaust List for the Transverse 1.8T – List of aftermarket exhausts
Fitting a Golf/GTI exhaust on a Jetta and vice-versa – How to modify a GTI exhaust to fit on a Jetta because of length differences


DIY / How-To / Technical

DIY: Cold Air Intake Install (1) - how to install an ECS Tuning XAS cold air intake system. May be used for other brands as well.
DIY: Cold Air Intake Install (2) - how to install a Carbonio cold air intake system. May be used for other brands as well.
DIY: Foam Filter Cleaning (.pdf) - how to clean a foam-style (ITG) filter

DIY: Exhaust Hanger Replacment – Replacing the stock exhaust hanger mounts
DIY: Magnaflow Catback Exhaust Install – A simple catback install, should help with most exhasuts
 

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[ BRAKES ]


Resources & Discussion

Brakes Technical Forum - general discussion about brakes including upgrades, pads, rotors, calipers, carriers, fluid, ABS, proportioning valves, stainless lines, e-brakes, etc.

Stock Brake Sizes - an overview of different factory brake sizes for all mk4's.
Common Brake Upgrades - list of common front and rear brake upgrades for all mk4's.
Upgrading Rear Brakes - discussion on options and value of rear brake upgrades
R32 Brake Conversion Checklist -


DIY / How-To / Technical

Tech: Brake Job Tools and Items - things you'll need for front and rear brake jobs, tools sizes etc.

DIY: Front & Rear Brake Pad & Rotor Replacement - high level install of pads and rotors for vr6/1.8t cars.
DIY: Front Brake Pad & Rotor Replacement - how to change rotors and pads on the front.
DIY: Front Brake Pad & Rotor Replacement for 2.0/TDI's - how to change your pad's and/or rotors on your 2.0/tdi.
DIY: Rear Brake Pad & Rotor Replacement - quick explanation of how to change the rear rotors and pads.
DIY: 12.3" Front Brake upgrade - upgrade to the 12.3" rotors and came on the 337/20AE/TT and 04.5+ GLI's.
DIY: Stainless Brake Line Install - how to install stainless brake lines
DIY: Tyrolsport Brake Caliper Stiffening Kit - how to add a Tyrolsport brake stiffening kit.

Tech: Brake Fluid Changes
DIY: Brake Fluid Flush

DIY: Brake Pad Wear Warning Indicator Bypass - how to turn off the brake pad warning light in the cluster if you are running aftermarket pads w/o sensors.
DIY: Brake Light Switch Replacement - rear brake lights not come on or rear brakes lights stay on? see this.

DIY: Emergency Brake Cable Replacement &/ Adjustment
 

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[ SUSPENSION ]


Resources & Discussion


Suspension Tuning Forum - discusssion of suspension tuning, swaybars, strutbars, springs, shocks, coilovers, etc.

Mark4 Suspension Geometry - why a majority of the time lowering a MKIV gains you more in looks than it does in handling.
Mark4 Suspension Height Comparison - between OEM, OEM "Sport" and Eibach Pro-Kit springs
Mark4 Guide to Camber and Alignments - what it is, what it does, and why we can't adjust it.
Mark4 Alignment Specs - general alignment specs for mk4's (there are variations, but all a4 chassis cars should be within these ranges).
The Damper Thread - how they work and what they do. excellent general thread, but has a mk4-centric view. read this thread if you consider yourself a car person.

General Lowering Discussion Lowering for looks vs. lowering for handling,
The "LOW" thread - pictures and wheel well measurements of cars considered "low" along with what suspension and wheel/tire combo yielded it.

Oversteer vs. Understeer
Swaybars 101
Front Swaybar Clearance & Lowering - find out if you may have axle clearance problems with a lowered suspension.
Rear Swaybar Options & Comparison List of rear sways for the MKIV.
Mark4 Coilover List
Coilovers vs. Spring/Shock Combo - can a spring & shock combo compete with coilovers?

Can I just put lowering springs on my stock dampers/shocks/strut?

It's not as easy as yes or not, but in the end, it's better to do it right the first time, read about the pro's and con's here.
Can I put a VR6 suspension on a 1.8t and vice versa? 2.0 and TDI? GTI and Jetta?

Why there is nothing technically wrong with "mixing" suspensions.
DIY / How-To / Technical

**Notice - The process for changing the suspension for any MKIV platform car is fundamentally the same. Therefore it does not matter if you are installing just springs, a cup kit, coilovers, a stock suspension, and if you are installing it on a Jetta, a Golf, a Wagon, a GTI, a 2.0, a TDI, a 1.8t or a VR6. Any suspension how-to is applicable. The same is generally true for swaybars and strutbars as well.

How: Strut Mount &/ Bushing Replacement w/o Spring Compressor

DIY: Shock & Spring Upgrade : Bilsten+H&R -
DIY: Shock & Spring Upgrade : Shine RSS - upgrade the seriously performing shine real street suspension kit.
DIY: Spring Upgrade : Eibach Pro-Kit - how to upgrade your stock suspension with new springs.

DIY: Coilover Suspension Install : H&R - by Noah

DIY: Front Swaybar Upgrade : Autotech (.pdf) - how to upgrade the front swaybar and drop the subframe.
DIY: Front Swaybar Bushing Replacement / Lubrication - do you have a front end creak over bumps? try lubing or replacing the swaybar bushings.
DIY: Rear Swaybar Install : Autotech
DIY: Rear Swaybar Install : Neuspeed

DIY: Front Upper Stressbar Install - Autotech
DIY: Front Upper Stressbar Install - Neuspeed
DIY: Front Lower Stressbar Install - Autotech

DIY: Rear Beam Bushing Replacement - hearing noises come from the rear suspension? you might want to check this out.
 

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[ WHEELS & TIRES ]


Resources & Discussion

FAQ: Wheel Tech - general information on wheel specs including Offset, Bolt Pattern, Center Bore, Backspacing, Diameter and Width.
FAQ: Tire Tech - general information tire specs including plus sizing, speed ratings, deciphering the sidewall ratings (ex. 225/45-17H).

Stock Tire Sizes - Recommended tire sizes (15" - 19" wheels) to keep you speedometer as accurate as possible. Including why moving from a 15" wheel to an 18" cannot affect the speedometer.
The Stretched Tire Thread - the hows and whys of poking and stretching.

VW OEM Wheel Gallery - pictures and names of OEM wheels and rims.
Mark4 Wheel Database - pictures of dozens of MKIV wheel/tire and suspension combinations.

Wheel Bolt Pattern and Offset, Spacers, Bolts, etc - Information on acceptable MKIV Bolt Patterns and Offset, Hub Bore, Wheel Bolt type (conical and ball seat), spacers, adapters etc.
Wheel & Tire Size Calculator - Use this to see how different wheel and tire sizes will affect your speedomter readings, or to just compare two different sized setups.
Wheel Weights - Outside thread with listing of many Aftermarket wheel weights.
Offset Calculator - See how a different wheel width/ offset will affect your tire position.
Mk4 Wheel Offset and Stance Picture Index - Use this to see examples of different offets

The Spacer Thread - How to choose the correct size of spacers for your desired look.
Using Flat 8mm Spacers with aftermarket wheels - Discusses the issue and solution for using lipless 8mm spacers with wheels that use centering rings.

Jetta Wolfsburg Wheels (RXII) Pitting Issues - discussion about pitting, discolored, and peeling BBS RXII's used on Wolfsburg Edition Jettas.
Mark4 Peeling Wheel Petition - discussion about peeling, discolored and peeling wheels on all MKIV cars.


DIY / How-To / Technical

DIY: OEM Wheel Lock Key Guide - how to identify what wheel lock you need

DIY: Wheel Polishing
DIY: Wheel Repair / Refinishing
DIY: Wheel Refinishing & Painting *dead pics

Wheel lock sizes
 

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[ OBD-II / ON-BOARD DIAGNOSTICS ]


Resources & Discussion

VAG-COM Diagnostic Forum

Ross-Tech VAG-COM
Ross-Tech Fault Code Wiki - comprehensive list of DTCs, descriptions, and possible solutions.

Diagnostic Flow Chart for bad MAF - it's not a bad MAF until you do this.

Aftermarket Radio Compatibility with K-Line OBDII Scanners - ie. VAG-COM, VAG 1551/1552; k-wire k wire k line


DIY / How-To / Technical

How: Setting Readiness Codes on a 12v (.doc)

How: ASR/ESP disable - disabling the electronic traction aids via the ECU using a VAG-COM

How: Testing MAF, O2 Sensors, and Catalytic Converters on a MKIV - using a VAG-COM.

How: Add Cruise Control - using VAG-COM
DIY: Key Remote Window Operation - with VDS-PRO *Dead pics*
 
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