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P0422 Diagnostic Trouble Code Discussion for March 2011

Catalyst Efficiency Below Normal (Bank 1)

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Trouble Ticket Help Requests for DTC P0422
Help Request Posted
2001 Volvo V70 2.4T 2.4L MIL Lamp on VIN: YV1SZ58DX1
P0422: cat efficiency below threshold. ... that has set a p0422 cat efficiency code. it has always been my experience that if the only code is a cat code the cat is bad. i have replaced the cat with what looked like a quality bosal cat twice now and the code keeps coming back. there are no o2 senso...
March 30, 2011