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What is the CKP on my 1996 Dodge Ram 1500 5.9L? Check engine with code P1391

Vehicle: 1996 Dodge Ram 1500 5.9L

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CKP is the Crankshaft Position Sensor 

and CMP is the Camshaft Position Sensor 

They are built into the distributor assembly, might need to be replaced 

If that does not fix the problem, I will check the timing 

Dodge Ram Crankshaft Position Sensor

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