Steering Angle Sensor

This procedure removes and replaces the steering angle sensor on a 2019 Mercedes-Benz G-Class with 4.0L Turbo V8. The sensor is located on the steering column beneath the lower dash panel and requires proper steering wheel alignment and system calibration after installation.

Warnings

Tools required

Parts

• Steering angle sensor × 1 — A0009050500 or equivalent for W463

Preparation

1. Park vehicle on level surface and set parking brake.
2. Turn steering wheel to center position with wheels pointing straight ahead.
3. Turn ignition off and remove key.
4. Disconnect negative battery terminal and wait minimum 15 minutes for airbag system capacitors to discharge.
5. Ensure you have access to Mercedes diagnostic equipment for post-installation calibration.

Procedure

1. 1

   Remove Lower Steering Column Trim Panels
   From the driver footwell, locate the lower steering column cover panels. Remove the Torx fasteners securing the lower cover (typically T20 or T25). The lower cover is usually two-piece construction with a main lower panel and a smaller knee bolster section. Carefully release any retaining clips by hand or with trim tools and remove both sections of the lower trim to expose the steering column. Note: Verify correct part number via Mercedes EPC for 2019 W463 chassis before ordering
2. 2

   Locate Steering Angle Sensor
   With the lower column covers removed, identify the steering angle sensor, which on the W463 is integrated into the steering column module / clock spring (SRS coil) assembly located behind the steering wheel hub. Confirm whether the sensor is serviceable separately or only as part of the steering column module before proceeding. Note the orientation of the sensor housing relative to the steering wheel center position.
3. 3

   Disconnect Steering Angle Sensor Electrical Connector
   Press the locking tab on the sensor electrical connector and carefully pull the connector away from the sensor body. The connector may have a secondary lock that must be released first. Allow the harness to hang free without strain.
4. 4

   Remove Sensor Mounting Fasteners
   Locate the mounting fasteners securing the steering angle sensor to the steering column. Remove the fasteners securing the steering angle sensor / column module per factory WIS documentation — exact count and Torx size must be verified for the 2019 W463 as they are not confirmed. Keep these fasteners organized as they may be specific lengths.
5. 5

   Remove Steering Angle Sensor from Column
   With fasteners removed, carefully slide the sensor housing off the steering shaft. Note the mounting method of the sensor/column module per factory documentation; on the W463 this is typically integrated into the steering column module rather than a split clamp ring. Note the orientation and any alignment marks on the sensor body relative to the steering column. Do not rotate the steering wheel after sensor removal.
6. 6

   Install New Steering Angle Sensor
   Position the new steering angle sensor over the steering shaft with the electrical connector oriented in the same position as the original. Ensure the steering wheel is still centered. The sensor housing should seat flush against the column mounting bracket. Align any indexing features or alignment marks.
7. 7

   Install Sensor Mounting Fasteners
   Install the mounting fasteners and tighten to the factory-specified torque for the 2019 W463 steering angle sensor / column module (value must be verified in Mercedes WIS before assembly). Verify the sensor housing is seated properly and does not have any gaps.
8. 8

   Reconnect Electrical Connector
   Connect the electrical harness to the steering angle sensor until the locking tab clicks into place. Ensure any secondary lock is engaged. Gently tug on the connector to verify it is fully seated and locked.
9. 9

   Reinstall Lower Steering Column Trim
   Reinstall the lower steering column cover sections in reverse order of removal. Align all mounting clips and secure with the original Torx fasteners. Ensure all trim pieces are properly seated and do not interfere with pedal operation.
10. 10

    Reconnect Battery and Perform Sensor Calibration
    Reconnect the negative battery terminal. Connect Mercedes Star Diagnostic System (SDS) or equivalent factory-level scan tool. Navigate to steering angle sensor calibration function. Follow on-screen prompts to perform steering angle sensor initialization and calibration. This typically involves confirming wheels are straight, centering the sensor, and performing a steering sweep test. Clear any stored fault codes related to steering angle sensor or ESP system after successful calibration.

Reassembly

1. Reinstallation follows removal in reverse order.
2. Ensure all trim fasteners are properly torqued and trim panels are fully seated.
3. Verify electrical connector is fully locked before reinstalling trim panels.

Verification

• Start vehicle and verify no warning lights related to steering, ESP, or stability control systems are illuminated on instrument cluster.
• Using diagnostic scan tool, verify steering angle sensor is reading 0 degrees with wheels centered and steering wheel centered.
• Perform a slow lock-to-lock steering test while monitoring sensor readings to confirm proper operation through full steering range.
• Test drive vehicle at low speed in safe area to verify ESP system functionality and proper steering response.
• Verify no fault codes are present in steering, ESP, or airbag control modules.

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