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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:

$30

Talent:

*

Tools:

5mm Allen

Applicable Models:

Mercedes-Benz 300CE (1990-93)
Mercedes-Benz 300E (1990-93)
Mercedes-Benz 300TE (1989-92)
Mercedes-Benz E320 (1994-95)

Parts Required:

New camshaft position sensor

Hot Tip:

Be sure the O-ring is replaced

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 sensor is located on the front left side of the cylinder head right beside the thermostat and water pump (red arrow).
Figure 1

The sensor is located on the front left side of the cylinder head right beside the thermostat and water pump (red arrow).

Pull the electrical connection (red arrow) straight away from the sensor (yellow arrow).
Figure 2

Pull the electrical connection (red arrow) straight away from the sensor (yellow arrow). Note: the coolant hoses have been removed in this series of pictures but you do NOT need to remove them to replace your sensor.

Use a 5mm Allen and remove the two bolts holding the sensor to the head (red arrows).
Figure 3

Use a 5mm Allen and remove the two bolts holding the sensor to the head (red arrows).

Pull the sensor (red arrow) straight back out of the head (yellow arrow).
Figure 4

Pull the sensor (red arrow) straight back out of the head (yellow arrow).

Check that the small O-ring on the sensor has not remained in the cylinder head.
Figure 5

Check that the small O-ring on the sensor has not remained in the cylinder head. If it has use a small pick to remove it making sure not to scratch the opening. Installation is the reverse of removal.

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Comments and Suggestions:
french02chris Comments: On the W124 M119 engine, make sure to have a multi-directional connector for socket wrench, as without one, it will be really hard to do the job, and you will get frustrated :
With the connector, I was able to change the sensor on my 1993 400E in less than 15 minutes...easy job!!
December 26, 2016
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
quest1966 Comments: See service manual operation 15-2143G: http://w124-zone.com/downloads/MB%20CD/W124/w124CD1/Program/Engine/104/Engine%20104%20Combustion%20I/15-2143G.pdf. If installing a new sensor, the gap should be checked which would require removing the valve cover. However, if you install it, don't check it, and no fault codes are produced, all is likely good. My sensor has a shim on it so the gap on some need to be adjusted.
June 12, 2015
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
oldtrucker Comments: I was under the impression that in some case, there would be some shimming required. I believe a feeler gauge is used to determine the distance between the sensor and the the sender on the cam shaft. This will require the Valve cover to be removed and measure it from atop.
Perhaps, I am going to deep with that and it probably is not necessary at all?
November 3, 2014
  Followup from the Pelican Staff: I do not recall this sensor needing a shim procedure. - Nick at Pelican Parts  

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Page last updated: Mon 1/16/2017 03:03:20 AM