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I also would like to know. I put a bad tank of gas in my Tahoe not too long ago, and the pre cat O2 sensor kicked on the CEL light. It ran like crap, and I was WAY down on power which sucked since we were camping, and I was pulling my camper.
I ran the tank to near empty, put good gas into it, and the CEL went off, and it ran great.
Bill
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