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Misfire

Discussion in 'GM Powertrain' started by KingDNH, Feb 13, 2008.

  1. KingDNH

    KingDNH New Member

    hello, I'm getting code p0135b that is causing my engine to missfire and then throws a missfire code. I've checked a ton of things, but don't know how to get rid of this!!!
    I've got a Chevy Suburban 03 AWD 5.3L
    Please help.
  2. GaryL

    GaryL Epic Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor

    P0135b is the code for the O2 sensor, bank 1 sensor 1. Probably need to replace this O2 sensor. It is the one on the drivers side exhaust closest to the engine.
  3. KingDNH

    KingDNH New Member

    I already changed the O2 sensors. Let me know if you think of something else, thank you!
  4. collinsperformance

    collinsperformance Epic Member 5+ Years 500 Posts

    not to be a pain, but new does not always mean good. i had many new parts that were junk. did you test the old one? you might have a wire or connector issue as well......mike
  5. dwill3015

    dwill3015 Epic Member 5+ Years ROTM Winner 1000 Posts

    the same thing happened to my wifes 2001 suburban and after much troubleshooting it turned out to be a bad coil pack

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