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Re: What Is It With GM O2 Monitors?
Posted to Emissions Forum on 9/22/2019 1 Reply

It's not every GM that has this O2 monitor issue. Somewhere in 2006 or 2007 GM changed the Readiness criteria.

Still, some set the monitors immediately While others almost never run the O2 monitor before any others. We are still allowed to have one Readiness ... Login to read more.

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