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Q: check enginelight on 2006 Audi A4 Quattro

what does a code 422 mean with check engine light on?
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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
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