Speed Sensors
The speed sensors , normally at the crank position, monitors the rotational speed of the crankshaft and uses this information to help govern fuel mixture and spark advance. It may be located on the flywheel, the main crank pulley, the camshaft or the crank itself. The engine may not start if such sensors fail.
Nowadays, more than 500 speed sensors are in Aopec portfolio, suitable for cars VW, Audi, BWM, Renault, Peugeot, Honda, Toyota, Nissan, Chevrolet, Ford, etc.