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I thought I should come back and reanswer this, for future googlers, because I found the cause of the P0422 error, and it wasn't the cat or O2 sensor at all! A while later, when I got another diagnosis, the computer was throwing a P0411: Secondary Air Injection System Incorrect Flow Detected also. As it turns out, a vacuum hose connecting to the SAI ...


This sounds like proper OBD-II software behavior. The CARB OBD-II rules state that for most trouble codes the check engine light should go off after two passed tests and then the codes should erase from memory after 40 passed tests. The fact that the light has gone off on its own is a good sign that the repairs were correct. No need to clear the codes, ...

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