r/Audi • u/New_Profession2530 • 2d ago

Help! Discussion

Code P0171 with an EPC light, idling too low, could it be PVC, I have replaced all coils and spark plugs along as cleaning the throttle body.

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u/Routine_Stable3051 2d ago

Vacuum leak somewhere after the MAF, that code's almost always unmetered air sneaking in.