jakematic

Just checking back in Mark to see if you've made any progress.

Spoke to a friend on the lambda fault and we both agree it's a wiring/cable issue.

markray

i have had to work alot lately, i have been driving it after clearing DTCs, filled up with gas after driving for several days and the MIL came one again a few minutes after getting back underway, have not scanned it. I will do it tomorrow and post results

markray

been on vacation. gonna order the oxygen sensor after this reply, the MIL keeps coming on after filling up with gas. So this irritation must end. Hoping it would just go away. I have replaced o2 sensors before and have the special socket, i imagine its a pain and have seen a special tool at ecs automotive, hope i dont need it. I will holler back when im done, i think i will order that v300 switch also, thanks for the help jake

markray

audi doesnt want us working on these cars, that was the worst oxygen sensor changeout ever

markray

WELL, i spent all fricking day on that POS and reset all DTCs, cleared the MIL, started it up with no MIL, then before shifting into drive, the MIL came back on, am I doing something wrong, did i just waste my day and money on a new O2 sensor, you were saying it was a wiring issue, WTF

jakematic

How does the wiring harness to the O2 sensor look ?
I suspect there is physical damage, e.g. crushed, broken, frayed wire...

markray

i didnt see anything, but i will go look

markray

i dont see or feel anything, this is nuts, is there a fuse associated that could be blown

jakematic

No fuse.
Are you still getting the 008753 ?
You're going to have to trace that wire all the way back unfortunately.
Continuity and/or tone tests will help find the issue

markray

i will get back on it tomorrow,thanks man