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What is the fault code P0336 on a 1997 Buick lesabre?

P0336 on a 1997 Buick LeSabre indicates a Crankshaft Position Sensor (CKP) A Circuit Range/Performance Problem.

This means the PCM (Powertrain Control Module) is detecting a signal from the crankshaft position sensor that's outside of its expected range or is performing erratically. The sensor itself might be faulty, or there could be a problem with the wiring or connections to the sensor.