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P0422 Diagnostic Trouble Code Discussion for May 2006

Catalyst Efficiency Below Normal (Bank 1)

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Trouble Ticket Help Requests for DTC P0422
Help Request Posted
2001 Hyundai Accent L 1.5L Hesitation, MIL Lamp on, PInging VIN: KMHCF35G41
P0422: Catalyst Efficiency Below Normal (Bank 1). Vehicle came in with MIL on P0422 and P1123. The car lacks power and pings badly. I began by following Mitchell's path for P1123. By their suggestions, I should replace the ECM. I'm not convinced. I have scope tested (Vantage PGM) O2 sensors comparitevely and ...
May 03, 2006
2000 Volvo V70 R AWD 2.3L MIL Lamp on VIN: YV1LV60DXY
P0422: Main Cat efficiency Low Bank 1 ECM-4801 always recurs. Hello all. We have this Volvo in right now that is giving us some grief. First off the car came in running rough, both at idle and at highway speeds. All of the listed codes were present in the computer when it arrived. Pulled the plugs and found that the elec...
May 19, 2006