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Crankshaft Positioning Sensor Replacement
 
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Pelican Technical Article:

Crankshaft Positioning Sensor Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$20 to $40

Talent:

*

Tools:

T30 Torx

Applicable Models:

Mercedes-Benz C350 (2008-14)
Mercedes-Benz GLK350 (2010-14)

Parts Required:

Crankshaft positioning sensor

Hot Tip:

Use a mirror

Performance Gain:

Smoother running car

Complementary Modification:

Replace Camshaft positioning sensors

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 flywheel is 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 crankshaft position sensor is not operating properly, your car will run very erratically or perhaps not at all.

Replacement of the sensor is not as easy as the camshaft sensors, unfortunately. The crankshaft sensor is located on the rear of the engine up against the firewall on the left side of the bell housing.

You will need to remove the engine covers (red and yellow arrows) and air intake ducts (green arrows) to perform this work.
Figure 1

You will need to remove the engine covers (red and yellow arrows) and air intake ducts (green arrows) to perform this work. Please see our article on engine cover removal for additional assistance.

You next need to remove the MAF (red arrow) and vacuum line (yellow arrow).
Figure 2

You next need to remove the MAF (red arrow) and vacuum line (yellow arrow). Please see our article on MAF sensor replacement for additional information.

Disconnect the breather hose from the rear of the right cylinder head (red arrow).
Figure 3

Disconnect the breather hose from the rear of the right cylinder head (red arrow).

Unclip the two plastic clips on the elbow piece between the MAF and throttle body (red arrow) and remove the elbow and attached hose.
Figure 4

Unclip the two plastic clips on the elbow piece between the MAF and throttle body (red arrow) and remove the elbow and attached hose.

You now have some room to work.
Figure 5

You now have some room to work. Depending on what hand you are better with reach down behind and disconnect the wiring for the sensor (red arrow).

Use a T30 Torx on a 1/4-inch drive socket and reach down and remove the single Torx screw (red arrow).
Figure 6

Use a T30 Torx on a 1/4-inch drive socket and reach down and remove the single Torx screw (red arrow).

You can now reach down and pull the sensor straight up and out.
Figure 7

You can now reach down and pull the sensor straight up and out. If the sensor is original there will be a zip tie that holds a wiring harness to it; you will need to clip the zip tie before you can get the sensor out. Installation is the reverse of removal.


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Page last updated: Mon 12/5/2016 02:54:19 AM