Question about Jeep Grand Cherokee

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Daughter has a 2002 Jeep Grand Cherokee Overland with the 4.7 SHO, her check engine came on, she took it to a local parts store and they hooked it up to a computoer and it showed code P1391, since we have bought this vehicle, she has been getting poor gas milage and notice it has been running rough at idle. Any advice would be great, also where is the cam shaft senor located on this vehicle???

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This code stands for intermittent loss of camshaft or crankshaft position sensor signal, usually not in all cases its the crankshaft sensor. The other fixes are wiring and the computer, but like I said it is usually the sensor. Good Luck Tim

Posted on Mar 25, 2011

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Hi Joko,

What you are describing is a failure of a main circuit. The first thing you should check is yo make sure that your battery is in good condition and that the cables are clean and tight. Let me know if yu find anything wrong there. Then there may be another main circuit problem. Check all of the fuses in your fuse block in the engine compartment. If any of these fuses are blown, it will usually cause several things to not work. If you find any fuses blown, DON'T REPLACE IT YET. Let me know WHICH fuse is blown and I can help you find out why it blew so you can get the problem fixed.

Get back to me on this and we will continue.

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