VW Vortex - Volkswagen Forum banner
1 - 7 of 7 Posts

·
Registered
Joined
·
37 Posts
Discussion Starter · #1 ·
Every few days my Tiguan won't start. When this happens, it will crank but not turnover. If I crank it for 10-15 seconds, it eventually starts. It starts immediately during short trips. It doesn't start after it's been sitting for several hours or overnight. The EPC comes on when it won't start. The battery is good. VAG-COM is reporting these codes: P0321 (G28), P0322 (G28) and 01259 (Fuel Pump Relay J17).

Guessing that the crankshaft sensor is going bad, I tried replacing it. I got the old one out, but the new one won't fit into the block; it's slightly too big in diameter. Did the old housing break off in the block? It's very hard to see in the hole. Here's a photo of the old and new sensor.

Gas Auto part Flashlight Cylinder Camera accessory
 

·
Registered
Joined
·
1,300 Posts
Yes, that sensor on the left is very broken. You are going to need to get those parts out of the block to get the new one in.

While that sensor is definitely bad and while a defective G28 would definitely cause a no start condition, your starting issue sounds more fuel pressure related, like it is dropping pressure when it sits for a long time. There are a few things that could cause that, like a leaking injector, leaking high pressure fuel pump, in-tank pump (it also includes the filter and low pressure regulator), fuel pump control module, etc. The fuel pump relay fault seems to point to the fuel pump control module. Oddly, the fault you show is not listed in the list of possible faults in the DTC chart for that ECU. Was there another number listed also, other than 01259? Do you hear the fuel pump run for a couple of seconds when you open the driver's door?

Generally, crank sensor fail when they get hot, and won't read until they cool off again, which is kind of the opposite of what you are seeing.

Interesting issue you have...
 

·
Registered
Joined
·
37 Posts
Discussion Starter · #3 · (Edited)
Is the old housing metal? Is there a trick to getting it out? There's no space to get a tool in there without removing a bunch of other parts. The old sensor reads 800k ohms between the two pins while the new one reads 800 ohms.
 

·
Registered
Joined
·
1,300 Posts
The housing is plastic. You pretty much pulled the guts out of it. Tricks to get it out? Whatever works... Just be careful not to push the pieces into the engine.

800k Ohms is pretty much open. It doesn't matter now if the old one was good or not. It is junk now.
 

·
Registered
Joined
·
37 Posts
Discussion Starter · #5 ·
Thanks for the detailed information. I can see the the broken housing, but there's not much to grab onto. If I can't remove it, I may have to take it to a shop. About a year ago, I replaced the high pressure fuel pump and the fuel pump control module that sits under the back seat. The low pressure pump does come on when I open the door.
 

·
Registered
Joined
·
37 Posts
Discussion Starter · #7 ·
I had more time to mess with it today. Just now I found the right size deep well socket that fits into the hole and covered it in JB Weld. Hopefully, when I pull on it with a wrench tomorrow, the housing comes out with it!
 
1 - 7 of 7 Posts
Top