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Camshaft Positioning Sensor Replacement
 
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Pelican Technical Article:

Camshaft Positioning Sensor Replacement

Tom Morr

Time:

1 hour1 hr

Tab:

$100

Talent:

*

Tools:

E8 Torx driver, small flat head screw driver

Applicable Models:

Mercedes-Benz R170 (1998-04)

Parts Required:

New camshaft position sensor

Hot Tip:

Don't drop the small bolts

Performance Gain:

Better control of fuel injection and engine timing

Complementary Modification:

Replace crankshaft position sensor

Your fuel injection computer (DME) may output a code that indicates a faulty camshaft position sensor (CPS). This important sensor tells the car's computer where the cams are located in relation to the combustion cycle. The DME takes the signals from both the cam position sensor and crankshaft position sensor, and calculates when to fire the fuel injectors and spark plugs. If the camshaft position sensor is not operating properly, your car will run very erratically or perhaps not at all.

Replacement of the camshaft sensor is easy especially when compared to replacing the crankshaft sensor. The camshaft sensor is located on the front left side of the engine, right between the valve cover and oil filter housing.

You will need to use a delicate touch when working with the connector as they tend to get really dried out and brittle.

Carefully release the connector from the sensor and using a small flat head screw driver to gently pry back the retaining clip.

Then use an E8 Torx to remove the two bolts holding the sensor to the head. Note: Mercedes-Benz, along with several other manufactures are using micro encapsulated bolts in some of their cars, especially in areas where there will be a lot of heat and vibration and you can not have a high torque on the bolt due to the aluminum the bolt goes into. If you want to reuse the bolt it is a good idea to clean it up and use a little blue Loctite on the threads. DO NOT use red Loctite or you will have a very difficult time getting it out again.

Remove the sensor from the head taking care that the rubber o-ring comes with it. If the o-ring stays in the engine use a small pick or screw driver to remove it.

Installation is the reverse of removal.

Replacement of the camshaft sensor is easy especially when compared to replacing the crankshaft sensor.
Figure 1

Replacement of the camshaft sensor is easy especially when compared to replacing the crankshaft sensor. The camshaft sensor (red arrow) is located on the front left side of the engine, right between the valve cover and oil filter housing.

You will need to use a delicate touch when working with the connector as they tend to get really dried out and brittle.
Figure 2

You will need to use a delicate touch when working with the connector as they tend to get really dried out and brittle. Carefully release the connector from the sensor and using a small flat head screw driver to gently pry back the retaining clip (red arrow).

Then use an E8 Torx to remove the two bolts holding the sensor to the head.
Figure 3

Then use an E8 Torx to remove the two bolts holding the sensor to the head. Note: Mercedes-Benz, along with several other manufactures are using micro encapsulated bolts in some of their cars, especially in areas where there will be a lot of heat and vibration and you can not have a high torque on the bolt due to the aluminum the bolt goes into. If you want to reuse the bolt it is a good idea to clean it up and use a little blue Loctite on the threads. DO NOT use red Loctite or you will have a very difficult time getting it out again.

Remove the sensor from the head taking care that the rubber o-ring comes with it.
Figure 4

Remove the sensor from the head taking care that the rubber o-ring comes with it. If the o-ring stays in the engine use a small pick or screw driver to remove it.

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Comments and Suggestions:
theeinferno Comments: After searching for over an hour, I can't find an OEM part number or any link that would allow me to purchase the rubber o-ring for this project. I have a pre-facelift SLK230 from 1998, and it seems Pelican only carries an o-ring for the post-facelift SLK320. There is no fitment guide to tell me if they are interchangeable, and my replacement camshaft position sensor didn't come with a new o-ring. I am hesitant to attempt reusing the old o-ring from the failed senson, since I don't know what condition it will be in. I've tried looking for "seal" and "gasket" as well as "o-ring" with no success.
August 23, 2016
  Followup from the Pelican Staff: I'm not having luck finding it either, but I just do the Q&A. I’m not the best with part numbers.

Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 

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