Mercedes-Benz ABS Wheel Speed Sensor Replacement
If the wheel speed sensor fails on your Mercedes-Benz, you will get an ABS warning light on the dashboard, plus your vehicle will go into LIMP mode, and the transmission may no longer shift properly. Learn how to fix the problem by replacing your Mercedes-Benz ABS wheel speed sensor.
Symptoms
- ABS ESP Warning Light ON
- Fault codes include wheel speed sensor signal implausible or wheel speed sensor supply.
- Loss of anti-lock brakes.
- Electronic Stability Control (ESP) will be disabled.
- Erratic shifting of the transmission or limp mode in some cases.
A defective ABS sensor illuminates the ABS, ETS, or ESP light on your instrument cluster. In rare cases, it may even set a check engine light or cause your car to not shift and go into limp (safe) mode. With a bad wheel ABS sensor, the anti-lock brakes will not function properly, and you increase the risk of skidding if you make emergency stops.
What you will need
- Mercedes ABS Wheel Speed Sensor
- Long Arm Metric Hex Key Set
- Torx Socket Set
- Torque Wrench
Some Mercedes-Benz has an Allen bolt, while others use a Torx bolt.
How to change an ABS wheel speed sensor on a Mercedes-Benz?
Before you get started, use a Mercedes-Benz scanner to read the codes from the ABS module and find out which sensor is faulty. You don’t need to replace all the sensors, just the faulty ones.
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- Raise the Car. First, loosen the lug nuts but do not remove them. Second, raise the car using your jack. Third, support your car with jack stands such as Torin 3-Ton Jack Stands.
- Locate Mercedes Wheel ABS Sensor. Remove the front wheel and locate the ABS wheel speed sensor.
- Behind the rotor, you will see a couple of cables connected to two sensors. One wire goes to the brake pads, which is the brake pad wear sensor. The second sensor goes to the ABS wheel sensor.
- Remove the ABS sensor bolt. Use a Torx socket to remove the bolt that holds the ABS sensor in place.
- The ABS sensor is held with a hex bolt, requiring a 10mm Allen wrench to be removed. This ABS sensor (also called RPM sensor) is located on the back of the steering knuckle.
- Remove the damaged ABS sensor. Pull out the old sensor.
- It is a good idea to take a picture of how your ABS wire is routed. When you install the new sensor, you may wonder how and where to place the wire.
- Remove cable. The ABS electrical wire is held in place by plastic clips. Pull the wiring harness away from the clips. You may have a plastic cover over the ABS sensor. Make sure to remove that before you pull out the ABS sensor. The plastic is typically held with clips that can be easily removed.
- Disconnect the ABS Sensor. Follow the ABS sensor cable to where it joins the connector under the front subframe.
- Pull up the metal C clip and unplug the old sensor from the connector. You may have to remove the wheel well liner to get to the connector. Separate the two connectors. You need a small screwdriver to pry the clips and separate the ABS and brake pad wear sensor.
- Install new wheel ABS Sensor. Install the new Mercedes ABS sensor in reverse order. The ABS sensor bolt must be tightened to 25 Nm using a torque wrench. If you need to buy a new ABS sensor, check out Amazon to order one for under $50.
How much does it cost to change a Mercedes-Benz ABS wheel speed sensor?
The dealer charges between $400 and $600 to change the ABS wheel speed sensor on Mercedes-Benz vehicles. However, with a few tools, you can replace a Mercedes-Benz for under $100.
Applications
- 2006 MERCEDES-BENZ CLS500 Front
- 2006 MERCEDES-BENZ CLS55 AMG Front
- 2007-2008 MERCEDES-BENZ CLS550 Front
- 2007-2008 MERCEDES-BENZ CLS63 AMG Front
- 2003-2008 MERCEDES-BENZ E320 Front
- 2006-2008 MERCEDES-BENZ E350 Front
- 2003-2006 MERCEDES-BENZ E500 Front
- 2004-2006 MERCEDES-BENZ E55 AMG Front
- 2007-2008 MERCEDES-BENZ E63 AMG Front
Part Numbers
- 2115402317
- ALS1288
- 5S11042
- SU12495
- 2115401317
- 211 540 23 17
We hope you find the Mercedes-Benz ABS Wheel Speed Sensor Replacement guide helpful. Check these troubleshooting and repair guides for more help on your Mercedes-Benz.
