Quote:
Originally Posted by Skyehigh55
My CEL for P0420 just came on as I was driving home from work this morning going through drive cycle to get all systems ready. Would I fail just because of this fault code whereas all other systems should be ready? Or do I have to clear the codes again, drive a proper drive cycle then get DEQ tested before the P0420 CEL gets thrown for being catless? I’m so confused here if I can pass or not since I believe I drove enough for all systems ready yet the timing perfectly triggers CEL for P0420
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That is correct, CEL / set codes means no emissions pass.
The info from Oregon (
https://www.oregon.gov/deq/filterdocs/driversguide.pdf) indicates that you can have one readiness monitor not set and still pass, so if you're able to time it right where your catalyst is the only monitor not ready / code not set you'd be able to pass.