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  1. Chevy Express Forum (GMC Savana)
    Hello, I had a check engine light diagnosed and it turned out to a faulty rear O2 sensor on bank 1. The mechanic said that Chevrolet issued a recommendation that all vans manufactured before Dec 2011 have issues with their O2 sensors and that I should replace all four sensors and re-flash my...
    express o2 sensor
  2. Chevy Express Forum (GMC Savana)
    On my 06 Express 3500 I’ve got codes P2A04 and 300, which is bank 2 sensor 2, and misfires detected. so I’m gonna try throwing a new sensor in. First off, do you think that’s a good place to start? Bank 2 Sensor 2 that’s passenger side behind the cat? Are there four sensors? Should I do all...
    bank 2 sensor 2 chevy express o2 sensor p2a04
  3. 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
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