There are many different components of a car that need to be monitored for speed. The speed of some components can affect the operation of other systems and the engine one the whole. Speed sensors detect the speeds of different elements of the vehicle and relay information to a control unit computer so that all the parts can work together as one. The speed sensor is an electrical device that picks up rotational speeds of different systems. These systems may include the camshaft speed or the speed the vehicle is traveling and everything in between. The sensor may also transmit this information directly to a read out such as the speedometer. Malfunctions in speed sensors may disrupt the timing of the combustion in the engine. They may also result in incorrect readouts on the speedometer, and nobody likes to get a speeding ticket. Speed sensors usually constitute a fairly urgent problem.