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A crankshaft sensor is a device used in internal combustion engines to monitor the position and rotational speed of the crankshaft. It plays a crucial role in the engine management system by providing data to the engine control unit, which uses this information to determine ignition timing and fuel injection. The sensor typically consists of a magnetic or Hall effect sensor that detects the movement of teeth on the crankshaft or a tone wheel attached to it. This data is then transmitted to the ECU to ensure proper engine performance and efficiency.