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  1. Chevy Silverado Forum (GMC Sierra)
    Code PO138/2271 ...so far I've put in new air filter, cleaned MAP sensor, as well as, 2 new sensors; I figured the first one was bad as well. My scan tool states that it is stuck rich and High voltage. Please help
    o2 sensor p0138 p2271
  2. Chevy Silverado Forum (GMC Sierra)
    I cleaned the MAF sensor, but the engine light came back on after a few miles. I was wondering what to look for next....TPS?.....injector?
    6.0 p0138
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