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P0431 Diagnostic Trouble Code Discussion for February 2010

Warmup Catalyst System Efficiency Low (Bank 2)

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Trouble Ticket Help Requests for DTC P0431
Help Request Posted
2001 Mazda Millenia 2.5L MIL Lamp on VIN: JM1TA22141
P0431: Warmup Catalyst Efficiency Below Normal (Bank 2). ... emission for 2 codes in computer. p0421 and p0431 catalyst efficiency below threshold bank 1 and 2. plugged scanner in and found upstream and downstream were doing the same switching on both banks which tells me that the cats ar...
February 08, 2010