Question about 2002 Chevrolet Avalanche

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Have 2002 chevy avalanche 1500 ( over 140,000 miles) multiple codes p137,p157,p158,p171, & p174..O2 sensors changed last year including both cats. Check engine light goes on then clears then goes back on..Any suggestions? driving me crazy.

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Junks I know mine is

Posted on Sep 26, 2015

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Sounds like a sensor is loose maybe not have good contacts?

Posted on Sep 11, 2010

  • rockabilly29 Sep 12, 2010

    sensors new replaced in jan, contacts good not loose..already checked

  • Daniel Berry Sep 12, 2010

    ok i think i have a idea look and see if your exhuast maniflod gasket is leaking it would mess up oxygen mixture and set off a o2 sensor code this is a very likely possiblity

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