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  1. TJ Wrangler Technical Forum
    So I just bought a 2003 Jeep Wrangler TJ SE 2.4L 4-cylinder and after a couple days of driving, I noticed the check engine light came on. There are multiple codes that come up during testing, which include 0340, 0123, 0320, 0352, and 1391. It runs fine for the most part. The check engine light...
  2. Engines & Drivetrain
    So I just bought a 2003 Jeep Wrangler TJ SE 2.4L 4-cylinder and after a couple days of driving, I noticed the check engine light came on. There are multiple codes that come up during testing, which include 0340, 0123, 0320, 0352, and 1391. It runs fine for the most part. The check engine light...
  3. WJ Grand Cherokee Forum
    Codes are P0320 and P0725, intermittent problems include engine stopping on idle, speeding on idle, sometimes at highway speed a violent jerk, then trans goes into limp-home mode (no first or overdrive). Could it be the crank position sensor, or maybe just an intermittent bad wiring connection...
  4. XJ Cherokee Technical Forum
    I recently went to get an inspection and I ended up failing due to the fact that my OBD-II Port will not communicate. I then took the dash apart to investigate and learned that the previous owner removed the check engine light. I replaced it and now the light stays on. The jeep has been...
  5. XJ Cherokee Technical Forum
    Vehicle is a 1996, 4.0L, cherokee. I have a good friend that works with me and when they hooked up the scanner for an emmisions check, it show up as vehicle does not communicate. When I plugged in my scanner it turns on, so there is power and yes the check engine light turns on with key in...
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