An automotive wheel speed sensor is a small electronic device located on each wheel hub or axle. It measures the rotational speed of the wheel and sends this data to the vehicle's control system, including the ABS and traction control systems.
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A wheel speed sensor or vehicle speed sensor (VSS) is a type of tachometer. It is a sender device used for reading the speed of a vehicle's wheel rotation. It usually consists of a toothed ring and pickup.
The wheel sensor has the task of recording the speed of the wheels and communicating this information to the driving safety systems in the form of an electrical signal.