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Re: Is the ECM really the culprit?
Posted to Technical Tips Forum on 1/10/2019

Love it!

Had an 07 Yukon do something similar to me recently. All 4 O2s going over a volt. Intermittent of course. I went so far as to swap both rear O2s, then finally got lucky and caught B2S1 going high first.

Your method sounds more organized. Login to read more.