The camshaft sensor is a critical sensor in the engine that detects the position of the camshaft. This information is used by the engine control unit to determine the precise timing for injection and ignition—especially in engines with variable valve timing. The sensor helps make the engine run more efficiently and environmentally friendly. In combination with the crankshaft sensor, it enables precise combustion control. A defective camshaft sensor can lead to starting problems, loss of power, or rough engine running.