P 0420 Cadillac Dts 2006. Visually inspect the related wiring harness and connectors. That is the most common problem that makes the check engine light appear, although there are other problems that can occur.
Question - I've had this code pop up every now and then; sometimes it clears itself and other times I clear it by clearing all codes.
That is the most common problem that makes the check engine light appear, although there are other problems that can occur.
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Check the "Possible Causes" listed above. Can anyone shed some light on what triggers it? Code came up cadillac convertor which was replaced light did not turn off.
