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Audi 100, S4: 1992-1994, A6, S6: 1995-1997 (C4) DTC 2331

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Last Post: Oct 29, 2009 6:20 PM Last Post By: Midniteoyl
100CS

Posts: 1
Registered: 12/25/07
DTC 2331
Posted: Mar 5, 2009 6:26 PM
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'93 100CS Avant with 185,000 miles. CEL rarely cames on (let's say for 10 minutes of the last 1000 miles put on it). Pulled code 2331. I see lots of threads where the fix is either vacuum leaks or oxygen sensor. Any suggestions on where to start? Car runs amazing but cold starts take longer.
Midniteoyl

Posts: 29
Registered: 03/14/09
Re: DTC 2331 (start with the oxygen sensor)
Posted: Apr 17, 2009 12:38 AM   in response to: 100CS in response to: 100CS
audi_02_sensor , dtc_p2331
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Best place to start would be the O2 sensor.
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