Pelican Parts
Mercedes-Benz Parts Catalog Accessories Catalog Mercedes-Benz How To Articles Mercedes-Benz Tech Forums
Call Pelican Parts at 888-280-7799
View Recent Cars  |Shopping Cart Cart | Project List | Order Status | Help
 >  >
Camshaft Position Sensor Replacement
 
Bookmark and Share

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.

Bookmark and Share
Comments and Suggestions:
Uncle Tom Comments: I have a 1992 300E with the mechanical fuel injection. There is no cam sensor where your pictures show one. Engine initially would not start when warm, sometimes, but would start after sitting for 30-60 minutes. Last time it started, it ran like it was cross-firing. Crankshaft SPEED sensor, on the flywheel, was replaced, and distributor cap, and did nothing. Is there a cam or crank POSITION sensor somewhere on this car?
October 7, 2017
TINMAN Comments: Replaced both cam and crank position sensors on my '03 E320. Computer is not reading them! Do I need to replace some part of my computer system? Estimated cost if so and can I get what I need from a salvage yard?
August 12, 2017
  Followup from the Pelican Staff: have you tested the sensor signals to the DME? I would start there. - Nick at Pelican Parts  
Unathi Comments: Good day i have a 124 merc 200E it cuts off in the middle of the road and i will have to wait for an hour for it to start again,but at night it drive much better. I just want to know what might be the cause of it? I have been told to many things now, one which is petrol pump, cruck angle sense
August 12, 2017
  Followup from the Pelican Staff: I can't help without knowing what is missing from the system when you are trying to start it. When your engine doesn’t start you’ll want to check the basics. Check spark, fuel injector pulse and fuel pressure, volume, quality and engine compression. Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
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  

QUICK LINKS
About Us
Careers
Pelican Parts, Inc.
1600 240th Street
Harbor City, CA 90710
Order Online or Call:
888-280-7799
CONNECT WITH US
NEWSLETTER
Sign Up for Pelican Pit Stop News & Special Offers
Page last updated: Tue 10/17/2017 03:15:03 AM