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Message: <blockquote data-quote="Gavin" data-source="post: 26427" data-attributes="member: 13902"><p>I have a 2001 gmc sierra 1500 that I recently put a stage 2 btr truck cam in and basically rebuilt the whole motor. I then discovered a very small head gasket leak that I fixed. Just for a little back story. Now I keep getting a p0420 code and I can’t get my 02 sensor heater monitor to complete. Could those be related? Im pretty sure my bank 1 cat is on the way out. I’ve tested all my 02 sensor heater and they’re all in ohm resistance range. I know im going to need a cat soon but is the o2 sensor heater monitor not completing related to the p0420 code?</p></blockquote><p></p>