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P0422 Diagnostic Trouble Code Discussion for February 2016

Catalyst Efficiency Below Normal (Bank 1)


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Trouble Ticket Help Requests for DTC P0422
Help Request Posted
2007 Chevrolet Silverado 1500 Classic WT 5.3L MIL Lamp on VIN: 1GCEK19B17
P0422: Small evaporative leak. ... not running test customer was told to drive 150 more to let test run before retesting,by then code p0422 came back and still did not run converter test either,perform smoke test found no evident leaks check voltage a vent solonoid within specs check wiring...
February 20, 2016