Too Lean CEL Codes
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Joined: Sep 2017
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Too Lean CEL Codes
Good morning all,
I have a 2002 Audi A4 3.0 V6. I am encountering consistent P0171 and P0174 codes with accompanying misfire codes. To this point I have replaced all of the vacuum lines with new rubber and cleaned the MAF sensor. About 5000 miles ago I replaced the driver side upstream O2 sensor. What are y'alls opinion of what to look for next?
I have a 2002 Audi A4 3.0 V6. I am encountering consistent P0171 and P0174 codes with accompanying misfire codes. To this point I have replaced all of the vacuum lines with new rubber and cleaned the MAF sensor. About 5000 miles ago I replaced the driver side upstream O2 sensor. What are y'alls opinion of what to look for next?
AudiWorld Member
Joined: Sep 2014
Posts: 181
Likes: 1
From: Northport, AL
I had a valve in the vacuum system of my 03 1.8t that had a plastic part go bad inside causing it not to close off like it should. It was under the intake but was able to reach around the intake to get the one time use claps off(destroyed) Code and misfires went away after replacement.
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