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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