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The speed sensor — also called the vehicle speed sensor, VSS, speedometer sensor, or Sensor, speed — measures road speed and transmits this data to the instrument cluster for the speedometer, and to the ECU for functions including cruise control, ABS calibration, and transmission shift scheduling on automatic gearboxes. A failed speed sensor causes an inoperative speedometer, incorrect gear-shift points on automatics, and can disable cruise control. CarParts247 stocks OEM and aftermarket speed sensors from Bosch, Continental, and Hella for a wide range of manual and automatic transmission vehicles.
Vehicles may have multiple speed sensors. The primary vehicle speed sensor is often mounted on the gearbox or differential, reading from a toothed ring on the output shaft. Separate wheel-speed sensors on each hub serve the ABS system and are covered under a different category. The VSS described here refers specifically to the gearbox or transmission-mounted unit used for the speedometer and ECU load calculations.
VSS failure is usually sudden rather than gradual.
The sensor is retained by a single bolt or clip at the gearbox casing. A small amount of gearbox oil may escape on removal — have a cloth ready. Fit the new sensor with a new O-ring if supplied, tighten to specification, and top up gearbox oil if necessary. Clear fault codes and verify speedometer operation on a short road test.
Commonly searched OE numbers fitting Speed Sensor from the TecDoc catalogue.
Common original equipment numbers linked to stocked alternatives.