Crankshaft sensor: Sensor that detects the engine spins. It synchronizes the spark of the spark plugs and the injection. It is placed in the steering wheel of the engine. It is also called "CKP sensor".
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This sensor aims at a serrated disc that is placed in one of the crankshaft ends and by counting these notches it can know in which position the crankshaft is placed and, at the same time, it can knows the position of every piston. If the engine stops starting all of a sudden, this sensor may be malfunctioning.