2005 optima cranksensor if you are a 2.4 the CKP sensor is located at front of crankshaft,behind the timing belt cover. If your engine is running rough or stalling try shaking the sensor connector to see if it affects engine operation. Inspect the male to female terminal for proper fit. If you are a 2.7 the CKP sensor is mounted on left side of engine block, near the fly wheel. For either engine size if you are cranking the engine and your tach reads zero,you are dealing with a failed CKP.
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