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Message: <blockquote data-quote="stutaeng" data-source="post: 26430" data-attributes="member: 6175">Probably not related. The way the heaters on the O2 work is, they just get power on cold start-up so the system can go into open-loop faster.Weird that you are getting the heater monitor code and your O2 resistance is checking out fine. If you don't mind crawling underneath and breaking O2 sensors loose, you can always swap the left-to-right O2 (confirm they are the same, I can't remember right now?) and see if the problem follows.</blockquote>