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Pelican Technical Article:

ABS Wheel Speed Sensor Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$15 to $100

Talent:

**

Tools:

Allen

Applicable Models:

VW Golf GTI (1999-00)
VW Golf GTI 1.8T (2002-05)
VW Golf GTI 20th Anniversary (2003)
VW Golf GTI 337 (2002)
VW Golf GTI GLS (2001)
VW Golf GTI GLX (2000-01)
VW Golf GTI VR6 (2002-05)

Parts Required:

ABS wheel speed sensors, high temp grease

Hot Tip:

Check for fault codes before replacing

Performance Gain:

Repair faulty ABS sensor

Complementary Modification:

New brake pads

The ABS wheel speed sensor on the GTI Mark IV 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 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.

In this article, I will go over how to replace the front and rear ABS wheel speed sensors on your GTI Mark IV.

While you may be able to perform this work while lying under the car with the wheels on, if you are just starting to work on your own car or like a little more room to work I recommend doing this job with the car safely in the air. Begin by jacking up and supporting the car, please see our article on jacking up your Mercedes. Remove the front and rear wheels.

Starting on the front wheels.
Figure 1

Starting on the front wheels. The speed sensor (red arrow) is located on the rear of the bearing housing by the tie rod.

Begin by removing the electrical connection from the sensor.
Figure 2

Begin by removing the electrical connection from the sensor.

Next, use a 5mm Allen and remove the bolt holding the sensor in place (red arrow).
Figure 3

Next, use a 5mm Allen and remove the bolt holding the sensor in place (red arrow). It is torqued on at a very low value but may be corroded so make sure you have the Allen well seated before loosening. You do not want to strip this bolt. The bolt securing the sensor is micro encapsulated, so if you are reusing it, you should clean it up and use a little blue Loctite when reinstalling it.

Use your hands and wiggle the old sensor from its mount.
Figure 4

Use your hands and wiggle the old sensor from its mount.

Clean the mounting area (red arrow) of any rust, grime or debris.
Figure 5

Clean the mounting area (red arrow) of any rust, grime or debris. Install new sensors with a thin coating of a high temperature grease to ABS sensor and housing. Install fastener and tighten. Make sure the sensor clears the toothed ring gear (yellow arrow).

Move to the rear of the car.
Figure 6

Move to the rear of the car. The speed sensor is located on the upper section of the trailing arm. Remove the electrical connection from the sensor.

Next, use a 5mm Allen and remove the bolt holding the sensor in place.
Figure 7

Next, use a 5mm Allen and remove the bolt holding the sensor in place. It is torqued on at a very low value but may be corroded so make sure you have the Allen well seated before loosening. You do not want to strip this bolt. The bolt securing the sensor is micro encapsulated, so if you are reusing it, you should clean it up and use a little blue Loctite when reinstalling it.

Use your hands and wiggle the old sensor from its mount.
Figure 8

Use your hands and wiggle the old sensor from its mount.

Clean the mounting area (red arrow) of any rust, grime or debris.
Figure 9

Clean the mounting area (red arrow) of any rust, grime or debris. Install new sensors with a thin coating of a high temperature grease to ABS sensor and housing. Install fastener and tighten. Make sure the sensor clears the toothed ring gear. Installation is the reverse of removal.

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Comments and Suggestions:
kal Comments: if the old abs sensor is coated in cardan and other residue is it worth trying to clean the tootring and the sensor
September 2, 2016
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