- Voltage
- 12 V
- Number of pins
- 3 -pin connector
- For steering manufacturer
- TRW
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Commonly searched OE numbers fitting Steering Angle Sensor from the TecDoc catalogue.
The steering angle sensor — abbreviated SAS or steering position sensor — measures the rotational angle and speed of the steering wheel and transmits this data to the electronic stability programme (ESP), electric power steering (EPS), and adaptive headlight systems. The ESP uses the steering angle to determine the driver's intended direction and compare it against actual yaw rate and lateral acceleration, intervening if the vehicle departs from the intended path. A faulty or uncalibrated SAS disables the ESP and EPS assist calibration, triggering warning lights and degrading vehicle dynamics. CarParts247 stocks steering angle sensors from Bosch, Continental, and Hella for a range of modern vehicles.
Because the SAS is safety-critical, the vehicle management system monitors its output continuously and disables dependent systems at the first sign of abnormal data.
Unlike most sensors, the steering angle sensor always requires a calibration (zero-point set) procedure after replacement. With the vehicle on level ground and the steering wheel pointing straight ahead, a diagnostic tool is used to set the sensor's straight-ahead reference. Without this step, the ESP cannot calculate whether the vehicle is understeering or oversteering and remains disabled.
Calibration is also required after any steering, suspension, or wheel alignment work that changes the straight-ahead steering position.
Not reliably. Some older vehicles allow a manual calibration procedure using ignition cycles and steering inputs, but modern vehicles with integrated SAS units require a tool that communicates with the ABS/ESP module directly.
Yes — ESP is not a mandatory MOT test item on most vehicles registered before ESP became compulsory. However, a vehicle with a known faulty safety system is not in a roadworthy condition for daily use.
Usually inside the steering column, typically integrated with the clock spring or positioned on the column shaft just below the steering wheel. Some vehicles use a sensor at the steering rack pinion instead.
Not directly — the SAS inputs to the ESP, not the power steering rack. However, a miscalibrated SAS causes the EPS torque assist to be applied asymmetrically, which can feel like a very mild pull.
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Common original equipment numbers linked to replacement-part pages.
