O2 sensor problem
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Joined: Jul 2005
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O2 sensor problem
I had the driver side pre-cat O2 sensor replaced. The guy that did it for me is great with old cars, but doesn't know much about anything about audis.
I have a 97 A4 2.8L quattro. The rack & pinion was 'leaking' and dripping down onto the sensor and my mech thinks this is why it went. I had him replace the 02 sensor a while back, and since that time, I have put less than 100 miles on the car.
The annoying thing is, the check engine light has come on three times in that time period. The first two times I went back and we looked up the code - it was the same sensor. Any ideas about what could be happening? I about someone having a similar problem a while back, but can't find it now...
thanks for the help.
I have a 97 A4 2.8L quattro. The rack & pinion was 'leaking' and dripping down onto the sensor and my mech thinks this is why it went. I had him replace the 02 sensor a while back, and since that time, I have put less than 100 miles on the car.
The annoying thing is, the check engine light has come on three times in that time period. The first two times I went back and we looked up the code - it was the same sensor. Any ideas about what could be happening? I about someone having a similar problem a while back, but can't find it now...
thanks for the help.
AudiWorld Senior Member
Joined: Mar 2000
Posts: 1,481
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From: Dallas TX
Did your friend use a plain scanner or VAG style diagnostic software?
It's possible the scanner is not reading all the codes and/or unable to reset them all.
The new O2 sensor may be faulty.
The new O2 sensor may be faulty.
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Re: Please post the codes that were pulled.
i don't know the codes off hand. i'll see if i can get them from him.
i'm not sure what the difference is between a plain scanner and a VAG. I know that it had a different 'card' or whatever that was put in to scan my car
i'm not sure what the difference is between a plain scanner and a VAG. I know that it had a different 'card' or whatever that was put in to scan my car
AudiWorld Senior Member
Joined: Mar 2000
Posts: 1,481
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From: Dallas TX
Chances are, the scanner used was just that - a scanner
the VAG style software mimics the dealers units which doesn't just read some basic codes, they read all codes and also can change & reset most.
If the only thing causing the check engine light was a faulty O2 sensor, and that was replaced, without resetting ECU, the check engine light will stay lit until after several clean starts/operations, (you may travel more than 100 miles) it will eventually reset itself.
If the only thing causing the check engine light was a faulty O2 sensor, and that was replaced, without resetting ECU, the check engine light will stay lit until after several clean starts/operations, (you may travel more than 100 miles) it will eventually reset itself.
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