Audi a4 1.8 t. Code 171
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1st Gear
Joined: Feb 2015
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Audi a4 1.8 t. Code 171
A4 1.8t. Code 171. System too lean. Help with problem did have four codes i put new 02 sensor Now only 171 Previous owner put new cone shaped air filter maybe something to do with that. I tried everything but replacing the other 02 sensor.
1st Gear
Joined: Jan 2013
Posts: 322
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