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P0431 Diagnostic Trouble Code Discussion for December 2007

Warmup Catalyst System Efficiency Low (Bank 2)

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Trouble Ticket Help Requests for DTC P0431
Help Request Posted
2000 Audi A4 Quattro Avant 2.8L MIL Lamp on VIN: WAUKH68D5Y
P0431: bank 2 warm up cat inefficiant. ... for this since the e-mail flood everyday is a lot. Thanks in advance. This Audi came in with the above P0431 code and I cleared the codes and test drove monitoring the front and rear O2 Sensors they look almost identical. If the cats were not $1000 I would...
December 10, 2007