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  1. 2

    P0301 not fixed after 1 month at dealership

    Thank you! I will look at the FSM. I replaced the serpentine belt a few months ago and will check for a vacuum leak and look into insulation material this weekend. Losing sleep over P0301.
  2. 2

    P0301 not fixed after 1 month at dealership

    Thank you. Yes the only code I still get is the P0301 code.
  3. 2

    P0301 not fixed after 1 month at dealership

    I have a 2002 TJ with 153,000 miles on it. Full tune up in winter 2017. One month ago the jeep was running so rough and multiple codes came up: P0320, P0300, P0301, P0306. I took the jeep to a local mechanic - he was unable to diagnose and suggested the jeep dealer. The jeep was at the dealer...
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