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ABS Sensor Replacement
 
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Pelican Technical Article:

ABS Sensor Replacement

Jared Fenton

Time:

2 hour2 hr

Tab:

$50 to $200

Talent:

**

Tools:

5mm Allen socket, floor jack, jack stands

Applicable Models:

Porsche 955 Cayenne (2004-10)
Porsche 955 Cayenne GTS (2008-10)
Porsche 955 Cayenne S (2003-10)
Porsche 955 Cayenne Turbo (2003-10)
Porsche 955 Cayenne Turbo S (2006-10)

Parts Required:

ABS Sensors/Anti-seize compound

Hot Tip:

Let the brakes cool before starting work

Performance Gain:

No more ABS fault codes

Complementary Modification:

Replace brakes
The ABS wheel speed sensor on the Porsche Cayenne 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 with a diagnostic program such as Durametric 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.

Sometimes, you get lucky and the sensor only needs to be cleaned as brake dust and dirt can sometimes affect the operation of the sensor. If you get a fault code and it points out a failure with a sensor, you may want to remove and clean it before buying a new one. If the fault code re-appears, you may have to replace it. 

Begin by safely jacking up and supporting the car on jackstands. For more info please see our article on Jacking up your Cayenne. Remove the front and rear wheels. The process is the same for both the front and rear wheels although some of the components around the sensor are different. 

Look behind the rotor towards the rear of the car. You will see a blue sensor sticking into the back of the wheel hub. You'll first need to remove the electrical connect from the sensor. Press the tab on the connector while pulling it off the sensor. Now remove the 5mm Allen head bolt holding the sensor in place. 

At this point, you can remove the sensor from the wheel hub. It may take a bit of force to remove it. Sometimes there can be a layer of brake dust and dirt built up inside that can hold the sensor in place. If it doesn't come out easily, try spraying a penetrant oil like Liquid Wrench around the sensor and let it soak in for a bit. 

Once the sensor is removed, clean the inside of the housing with brake cleaner. You'll want to install the new sensors with a thin coating of anti-seize compound to the ABS sensor and the inside of the housing. It's also a good idea to put a drop of blue Loctite on the Allen bolts before re-installing them. All that's left is to plug the electrical connectors back in and you're done.
Shown here is the ABS sensor mounted on each rear wheel hub on the Cayenne.
Figure 1

Shown here is the ABS sensor mounted on each rear wheel hub on the Cayenne. Begin removing the sensor by first pressing the locking tab (green arrow) and then pulling the electrical connector off.

Now remove the 5mm Allen head bolt holding the sensor to the hub (green arrow).
Figure 2

Now remove the 5mm Allen head bolt holding the sensor to the hub (green arrow).

Here is the ABS sensor removed from the rear wheel hub.
Figure 3

Here is the ABS sensor removed from the rear wheel hub.

In thisPicture, you can see the accumulation of dirt and brake dust that has built up around the mounting hole (green arrow).
Figure 4

In thisPicture, you can see the accumulation of dirt and brake dust that has built up around the mounting hole (green arrow). Take some time to clean the area up well before installing the new sensor. Be sure to coat the inside of the mounting hole with a little anti-seize compound beforehand.

Shown here is the ABS sensor for the front wheel.
Figure 5

Shown here is the ABS sensor for the front wheel. As you can see, the sensor is mounted basically the same as the rear ones. Press the locking tab (green arrow) and pull the electrical connector off. Then remove the 5mm Allen head bolt (yellow arrow) and pull the sensor out.

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Comments and Suggestions:
sandiego Comments: Could you expand the article to include troubleshooting hints to determine ideally which of the 4 sensors is bad? Rare that all 4 fail at once. For example a continuity check? Does the system ever fail only because of build up of brake pad dust, which could be cleaned off?
February 25, 2015
  Followup from the Pelican Staff: brake dust or minor debris does not cause sensor issues. I have seen large rust flakes cause issues, but that is about it.

If we get the chance to create the trouble shooting article, we will. - Nick at Pelican Parts
 
James Comments: Messrs. Dempsey and Fenton:

Guys, you have done an exemplary job of detailing the process here complete with honest to goodness bright clear and large photos. You can be extra proud of a 5 star job well done. In fact, it would take a real Alfred E. Newman to just not "get it". Whomever is writing these instructions is quite literate and that makes for extra clarity. Bravo. I could add nothing to your fine work except to give a hat-tip to the pros.
March 5, 2014
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 

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