Question about Jeep Grand Cherokee
P0301 is #1 cylinder misfire detected and is most likely related to a worn spark plug that is need of replacement. All plugs should be replaced if replacing one. Not sure how many miles you have on this vehicle, or if plugs were ever installed, but this is the basic step to take in diagnosis.
Posted on Jun 02, 2010
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Posted on Jan 02, 2017
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