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The saga continues… CEL on again 3 days later, code P0421 warm up catalyst efficiency bank 1 below threshold, so it’s at the dealership AGAIN!  Most of what I researched on the web says O2 sensor. 

I did receive my monthly OnStar diagnostic check email, and it says low battery… so I’m wondering if I truly have a low battery, and that could be causing electronics issues?


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