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P2101 CHEVROLET -

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My 06 trailblazer set a P2101 code. The only symptom is that the light is on. It hasnt lost power and it runs fine. I reset the PCM and it took about 300 miles before the light came back on. This was over 2 days of driving. Where should I start?

Vehicle: 2006 trailblazer 4.2

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