2006 Audi A4 Quattro Q&A

2006 Audi A4 Quattro Question: check enginelight

what does a code 422 mean with check engine light on? -
Answer 1
If you are talking about a P0422 trouble code (P0422 Main Catalyst Efficiency Below Threshold, Bank #1), then it refers to the efficiency of the catalytic converter. Here is some related info: http://repairpal.com/OBD-Code-P0420 -