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ABS Wheel Speed Sensor Replacement
 
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Pelican Technical Article:

ABS Wheel Speed Sensor Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$40 to $200

Talent:

**

Tools:

10mm wrench, E12 wrench, floor jacks, jack stands, wheel chocks, safety glasses, torque wrench

Applicable Models:

Mercedes-Benz C250 (2012-14)
Mercedes-Benz C300 (2008-14)
Mercedes-Benz C350 (2008-14)

Parts Required:

ABS wheel speed sensors

Hot Tip:

Check for fault codes before replacing

Performance Gain:

Repair faulty ABS sensor

Complementary Modification:

New brake pads

The ABS wheel speed sensors on the W204 monitors road wheel movement and sends an electronic signal to the ABS module. This signal is used to calculate road wheel speed to help with ABS braking and stability control features. When an ABS wheel speed sensor fails, the ABS module loses road wheel speed for the corresponding wheel and sets a fault code for the ABS wheel speed signal. When a fault code is set, the ABS warning light will illuminate. You will have to scan the module and read the fault codes to determine which speed sensor is the problem. Keep in mind, other problems can illuminate the ABS warning light. Be sure to scan and read fault codes before you start replacing expensive parts.

Begin by safely raising and supporting the vehicle and removing the wheels on the sensors you are changing. Please see our articles on these procedures for additional help.

Front- You will need to loosen the front fender well liner (red arrow) enough so you can remove the rear liner (yellow arrow).
Figure 1

Front- You will need to loosen the front fender well liner (red arrow) enough so you can remove the rear liner (yellow arrow). Please see our article on fender liner removal for additional assistance.

Front- With the liner off you can access where the front ABS sensor is routed to the pass through connection as well as access it's mounting points (yellow arrow).
Figure 2

Front- With the liner off you can access where the front ABS sensor is routed to the pass through connection as well as access it's mounting points (yellow arrow).

Front- Disconnect the sensor form the pass through connection by pressing down on the wire (red arrow) and pulling the sensor out.
Figure 3

Front- Disconnect the sensor form the pass through connection by pressing down on the wire (red arrow) and pulling the sensor out.

Front- Disconnect the cable from the holder on the brake lines (yellow arrow) and where it connects to the inner fender (red arrow).
Figure 4

Front- Disconnect the cable from the holder on the brake lines (yellow arrow) and where it connects to the inner fender (red arrow).

Front- Remove the cable from the holder on the spindle (red arrow).
Figure 5

Front- Remove the cable from the holder on the spindle (red arrow). Then use a 10mm wrench, and remove the single bolt holding the sensor in place (yellow arrow).

Front- All of the brake and suspension hardware is considered single use and comes microencapsulated from the factory.
Figure 6

Front- All of the brake and suspension hardware is considered single use and comes microencapsulated from the factory. Make sure to replace the hardware when performing this job.

Front- With the bolt removed, pull the sensor out from the steering knuckle (red arrow).
Figure 7

Front- With the bolt removed, pull the sensor out from the steering knuckle (red arrow).

Front- Installation of the new cable is the reverse of removal.
Figure 8

Front- Installation of the new cable is the reverse of removal.

Rear- To replace the rear sensor you will need to remove the rear fender well liner (red arrow).
Figure 9

Rear- To replace the rear sensor you will need to remove the rear fender well liner (red arrow). Please see our article on fender liner removal for further assistance.

Rear- The rear senor is similar to the front in that it runs from the wheel hub to the pass through connection in the fender well (red arrow).
Figure 10

Rear- The rear senor is similar to the front in that it runs from the wheel hub to the pass through connection in the fender well (red arrow).

Rear- Disconnect the sensor from the pass through connection by pressing down on the wire (red arrow) and pulling the sensor out.
Figure 11

Rear- Disconnect the sensor from the pass through connection by pressing down on the wire (red arrow) and pulling the sensor out.

Rear- Remove the cable from the plastic holder in the wheel well.
Figure 12

Rear- Remove the cable from the plastic holder in the wheel well.

Rear- Use an E12 wrench and remove the plastic mount that holds the cable and sensor in place (red arrow).
Figure 13

Rear- Use an E12 wrench and remove the plastic mount that holds the cable and sensor in place (red arrow).

Rear- All of the brake and suspension hardware is considered single use and comes microencapsulated from the factory.
Figure 14

Rear- All of the brake and suspension hardware is considered single use and comes microencapsulated from the factory. Make sure to replace the hardware when performing this job.

Rear- With the bolt and mount removed you can pull the sensor out from the wheel carrier.
Figure 15

Rear- With the bolt and mount removed you can pull the sensor out from the wheel carrier. Installation is the reverse of removal.








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