Steering Angle Sensor

Replace or recalibrate the steering angle sensor located in the steering column to restore proper ESP, traction control, and active safety system functionality.

Warnings

Tools required

Parts

• Steering angle sensor × 1 — A2215450316 or equivalent
• Lower steering column cover clips (if broken) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and ensure front wheels are pointed straight ahead
2. Turn ignition off and remove key from ignition
3. Disconnect battery negative terminal and wait minimum 15 minutes for airbag system to discharge
4. Lower steering column to lowest position and telescope fully out for access
5. Set parking brake and place wheel chocks behind rear wheels

Procedure

1. 1

   Remove lower steering column covers
   Using T20 Torx bit, remove the two screws securing the lower steering column cover. Carefully pull the lower cover away from the column, releasing the retaining clips. Remove the upper steering column cover by releasing the clips on both sides and lifting upward. Set covers aside in a safe location to prevent damage.
2. 2

   Disconnect diagnostic connector
   Locate the 6-pin diagnostic connector on the left side of the steering column near the instrument cluster. Press the locking tab and carefully disconnect the connector. This connector is used for steering angle sensor communication.
3. 3

   Remove knee bolster panel
   Using 8mm socket, remove the four bolts securing the driver's knee bolster panel below the steering column. Carefully pull the panel forward and disconnect any electrical connectors for lights or sensors. Remove panel completely to access steering column mounting area.
4. 4

   Locate and access steering angle sensor
   The steering angle sensor is located on the steering column shaft below the steering wheel, integrated into a ring-shaped module. Identify the sensor electrical connector with a gray or black housing on the sensor body. Note the orientation of the sensor relative to the steering shaft for proper reinstallation.
5. 5

   Disconnect steering angle sensor electrical connector
   Press the locking tab on the steering angle sensor electrical connector and carefully pull to disconnect. The connector may be tight due to age and location. Use a flat-blade tool if necessary to assist with releasing the locking tab, but avoid damaging the connector housing.
6. 6

   Remove steering angle sensor mounting hardware
   Using T30 Torx bit, remove the three mounting screws securing the steering angle sensor to the steering column. The screws are evenly spaced around the sensor ring. Keep screws organized as they may have thread-locking compound applied.
7. 7

   Remove steering angle sensor
   Carefully slide the steering angle sensor unit off the steering shaft. The sensor fits over the shaft and may require gentle wiggling to release. Do not force or twist excessively. Inspect the sensor mounting surface on the steering shaft for debris or damage and clean if necessary with a lint-free cloth.
   ⚠Do not rotate the steering wheel or allow the steering shaft to turn once the sensor is removed. This will cause loss of calibration and potential clock spring damage.
8. 8

   Install new steering angle sensor
   Align the new steering angle sensor with the steering shaft, ensuring the sensor is oriented correctly with the flat side or alignment key matching the shaft. Slide the sensor onto the shaft until it seats fully against the mounting surface. Verify the sensor sits flush and is not cocked or misaligned.
9. 9

   Install sensor mounting screws
   Install the three T30 Torx mounting screws finger-tight first to ensure proper alignment. Tighten screws in a cross-pattern to ensure even seating. Torque screws to specification gradually in multiple passes.
   Torque spec

   Cover Screws15 Nm (11 lb-ft)
10. 10

    Reconnect electrical connector
    Reconnect the steering angle sensor electrical connector, pressing firmly until the locking tab clicks into place. Verify the connection is secure by gently pulling on the connector. Route any wiring away from moving parts and heat sources.
11. 11

    Reinstall knee bolster and column covers
    Reinstall the knee bolster panel and reconnect any electrical connectors. Install and torque the four 8mm mounting bolts. Reinstall the upper and lower steering column covers, ensuring all clips engage properly. Install the two T20 Torx screws in the lower cover.
12. 12

    Reconnect battery and perform sensor calibration
    Reconnect the battery negative terminal. Turn ignition to position II (all systems on, engine off). Connect Mercedes-Benz STAR Diagnostic System or compatible scan tool. Navigate to steering angle sensor adaptation/calibration function. Follow on-screen prompts to calibrate sensor with wheels straight ahead. Clear any stored fault codes related to steering angle sensor, ESP, or stability control systems.
    ⚠Sensor calibration MUST be performed using proper diagnostic equipment. Failure to calibrate will result in ESP, traction control, and safety system malfunctions.

Reassembly

1. Verify all steering column covers and panels are properly secured with no gaps or loose clips
2. Ensure all electrical connectors are fully seated and locked
3. Confirm steering wheel returns to center position smoothly without binding

Verification

• Start engine and verify no warning lights remain illuminated on instrument cluster (ESP, ABS, steering warning lights should be off)
• Using diagnostic tool, verify steering angle sensor is reading 0 degrees with wheels straight ahead (tolerance +/- 3 degrees)
• Turn steering wheel lock-to-lock slowly and verify sensor reading changes smoothly from approximately -720 to +720 degrees
• Test drive vehicle and verify ESP, traction control, and stability systems function properly during turns and lane changes
• Verify no fault codes are present in steering angle sensor, ESP, ABS, or related systems using diagnostic scan tool

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