Hi
I posted this a while about about my 94T/A A4 with about 117000 miles on it. The car doesn't idle and sometimes at WOT it hesitates at 1800-2000rpm and then it's fine. At normal driving the hesitation is gone. I was told by you guys that some of you had the same problem and it was the O2 sesor. Well I went to replace this at this Shop close by my house and they Told me that I have 3 sensors. 2 at the headers and 1 at the exhaust. I was under the impression that It was 2, 1 sensor at the end of the headers and one at Exhaust.So I am surprised and I didn't get them to do it because I just wanted to make sure. Please help me out...thanx

 

If you have a 94 you will only have 2 sensors. One on each exhaust side. there is no way you will have another.