Originally Posted by
wetamup2k3g
If it was severe, the light would stay on. From what I understand, if the condition does not repeat itself in five starts, the CEL will go out. If your cat was really bad the condition would repeat often enough that the light would stay on. It's probably on its way out but it should pose no drivability issues if its only a P0420 or P0421 code. A clogged cat however would probably cause the same codes I think and would probably kill some performance. Your trans fluid and spark plugs needing change out is probably what you feel is affecting your performance. Hope this helps!
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