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P0431 Diagnostic Trouble Code Discussion for December 2012

Warmup Catalyst System Efficiency Low (Bank 2)

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Trouble Ticket Help Requests for DTC P0431
Help Request Posted
2004 Kia Amanti 3.5L MIL Lamp on, No Accel VIN: KNALD12414
P0431: Main Catalyst Efficiency Deterioration (Bank 2). ... plug replacement, customer calls and says car was running fine, then started up one time and it was running poorly, had no power and check engine light was on. When I looked at the car, it was running fine, with no symptoms besides ses light. He says car w...
December 03, 2012
2001 Hyundai XG300 3.0L No Start VIN: KMHFU45D71
P0431: Warmup Catalyst Efficiency Below Normal (Bank 2). Hello all;winding down to the holiday and this shows up on a hook! Never saw one of these before;suspected timing belt as cause for no start;pulled cam belt covers to verify timing marks ok.Tested compression;marginal on front bank;70 to 100;cylinders washed? ...
December 20, 2012