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Camshaft Position Sensor Replacement
 
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Pelican Technical Article:

Camshaft Position Sensor Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$40 to $900

Talent:

**

Tools:

E8 Torx, small flathead screw driver

Applicable Models:

Mercedes-Benz W204 (2008-15)

Parts Required:

New camshaft position sensor

Hot Tip:

Clean the area before removing the sensor

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). These important sensors tell 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 sensors and crankshaft position sensor and calculates when to fire the fuel injectors and spark plugs. The sensors also work in conjunction with the variable cams. If the camshaft position sensors are not operating properly, your car will run very erratically or perhaps not at all.

There are four camshaft sensors on the C350 motor, one for each intake and one for each exhaust cam. The sensors are located at the front of the motor on the end of each cam housing. Replacement of the camshaft sensor is easy especially when compared to replacing the crankshaft sensor.

To replace the camshaft sensors you will need to remove the front engine cover (red arrow) by pulling it straight up from the front.
Figure 1

To replace the camshaft sensors you will need to remove the front engine cover (red arrow) by pulling it straight up from the front. Remove the two air intake ducts by compressing them in off the air filter cover then slipping them off the ducts (yellow arrows). Please see our article on engine cover removal for additional assistance.

The four sensors are located on the end of the cam housings on each head (yellow arrows).
Figure 2

The four sensors are located on the end of the cam housings on each head (yellow arrows).

On the left side bank you can remove both the intake cam (red arrow) and exhaust cam (yellow sensor) without removing any other components.
Figure 3

On the left side bank you can remove both the intake cam (red arrow) and exhaust cam (yellow sensor) without removing any other components. Note: the oil cooler and power steering reservoir have been removed for other jobs; you do NOT need to remove them to replace the sensors.

The clips on the electrical connections are simple squeeze in and pull up connections but the tabs (red arrow) get very brittle and will probably break when you remove them.
Figure 4

The clips on the electrical connections are simple squeeze in and pull up connections but the tabs (red arrow) get very brittle and will probably break when you remove them. If the tab breaks do not worry, just make sure the connections are properly seated when reconnecting.

A single E8 Torx holds the intake and exhaust sensors in place.
Figure 5

A single E8 Torx holds the intake and exhaust sensors in place.

With the bolt removed you can pull the sensor from the head.
Figure 6

With the bolt removed you can pull the sensor from the head.

With the sensor removed check that the mounting surface is clean and flat (red arrow) as well as have a look inside the port to make sure there is nothing that is blocking the magnet from sensing the cam.
Figure 7

With the sensor removed check that the mounting surface is clean and flat (red arrow) as well as have a look inside the port to make sure there is nothing that is blocking the magnet from sensing the cam.

If you are removing the sensor to perform other work and reinstalling it always replace the O-ring to prevent leaking oil (red arrow).
Figure 8

If you are removing the sensor to perform other work and reinstalling it always replace the O-ring to prevent leaking oil (red arrow).

On the right cylinder bank you can see the intake sensor (yellow arrow) and the exhaust (red arrow).
Figure 9

On the right cylinder bank you can see the intake sensor (yellow arrow) and the exhaust (red arrow). You will need to move the air switch over valve (green arrow) out of the way of the intake sensor.

Using just your hands release the plastic tab on the back of the switch over valve (red arrow) and slide it off the mount (yellow arrow).
Figure 10

Using just your hands release the plastic tab on the back of the switch over valve (red arrow) and slide it off the mount (yellow arrow). You can now remove the intake sensor. The procedure for the sensor removal and replacement is the same. Installation is the reverse of removal.

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Page last updated: Mon 12/5/2016 02:53:00 AM