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P0431 Diagnostic Trouble Code Discussion for June 2009

Warmup Catalyst System Efficiency Low (Bank 2)

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Trouble Ticket Help Requests for DTC P0431
Help Request Posted
2002 Audi A4 3.0L Misfire, MIL Lamp on VIN: WAULT68E42
P0431: cat bank 2. this well maintained car was presented to us with a mil light and idle misfire issue...not a flat out miss but definatley not running as crisp as this car does.short and long term fuel trims are basically at zero give or take a percentage point-1.5 to.75but i ...
June 12, 2009