Question about 2002 Jeep Liberty

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Check Engine Light P0302 Code

I have a 2002 Jeep Liberty Sport 4WD 6 cyl. I have had it to a Jeep dealership and two other mechanics with no answers. The check engine light has come on since September 2008. Numerous things have been done to try and cure the problem to no avail. My check engine light is currently on and I don't know what else to do. The dealership tells me the next step is to pull apart the cylinder which alone will cost $1,000 and then to look at it and fix it will cost over and above that. Ridiculous especially after I spent almost $1500 already on it and they haven't fixed the problem. The things that were done is cleaning the fuel system (twice), doing a compression test that came back fine, flipping the coils (not replacing it), changed spark plugs, 6 cylinder tune up, switched injectors to see if I would get the same code (which I did), cleaned combustion chambers. I really like my Jeep but I don't know what else to do or where else to go.

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  • Anonymous Mar 05, 2009

    had the same problem and was a cracked cylinder head

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If its the 4.0 engine......Replace the spark plugs

Posted on Aug 24, 2010

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P0302 is a cylinder #2 misfire. when they swiched the coils did the misfire follow the coil or did it stay on cyl.#2. if the problem stayed with #2 they need to pull the cylinder head and check the valves with known good valves. have them install it into the cylinder head with valve lapping compound and run a pattern. if the cylinder head comes out with a good pattern replace the valves with the new pieces and reassemble the motor. if not the vehicle will need a new cylinder head

Posted on Jan 10, 2009

  • emmett408 Aug 24, 2010

    If it is the 4.0 inline 6 engine, I had the same code

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