SASSensor

Steering Angle Sensor (SAS)

Group: Chassis and safety

The steering angle sensor tells the system where the driver is steering. Together with the yaw rate and lateral acceleration sensor, it lets stability control (ESP, ESC, VSC) detect skids and correct them by braking individual wheels.

Contents

What does the SAS sensor do?

Stability control compares the path the driver wants (steering angle and speed) with the path the vehicle is actually following (yaw rate and lateral acceleration). If they do not match, it brakes a specific wheel and cuts power to correct understeer or oversteer. The angle sensor must be calibrated to 0° with the wheels straight; otherwise the system intervenes when it should not, or fails to intervene when it should.

Where is it located?

On the steering column, behind the steering wheel, usually built into the clockspring assembly. The yaw rate and acceleration sensor is usually under a seat or in the center console.

Signal type and reference values

  • Optical or magnetic sensor with a digital output, usually over the CAN network.
  • Read it with a scan tool: 0° with the wheels straight; positive or negative values depending on the direction of the turn.

Values are a guide only: always check the manufacturer's data for your vehicle.

Symptoms of a bad SAS sensor

  • Stability control and ABS lights on.
  • Stability control intervenes in normal corners or in a straight line.
  • Off-center steering wheel after an alignment, plus a stability warning.
  • Codes C0455, C0460 and U0126.

How to test the SAS sensor step by step

  1. With the wheels straight, the scan tool should show 0° (within a few degrees).
  2. Turn the steering wheel from lock to lock: the reading should change continuously.
  3. After replacing the column or the clockspring, or after an alignment, run the sensor calibration with the scan tool.
  4. Check the CAN network if there are U communication codes.

Trouble codes related to the SAS sensor

Frequently asked questions about the SAS sensor

Does the steering angle sensor need calibrating after an alignment?
Yes, on most vehicles with stability control. If it is not done, the warning light may come on or the system may act incorrectly.
Does the steering angle sensor affect power steering?
On vehicles with electric power steering and lane assist, yes: it is used to center the wheel and for automatic corrections.

Updated September 25, 2026. Values are a guide only: always confirm them in the service manual for your engine.

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