Re: Installing both o2 sensors....easy or pay to have done? (vagvr6)
get the bentley manual, it tell's how to test the o2's using a volt meter. it seemed to involved when I read thru it the first time, so I just dropped an easy
$200 for some new ones and peace of mind.
as far as changing them yourself, as long as you can get your car up high enough, it shouldn't be a problem. They're positioned so that room for leverage is necessary. Unless they're seized in the bungs, then it may be easier to have it "professionally" done. Just make sure you re-tuck the wire from the rear one back away from the exhaust. Mine catches under the heat-shield and actually clips to it in some areas (you can always use plastic ties). The last thing you want is for the lead to melt, as they are not a cheap investment (almost $200 for a pair of Bosch ones from an internet site).