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Mercedes Camshaft Positioning Sensor
 
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Pelican Technical Article:

Mercedes Camshaft Positioning Sensor

Steve Vernon

Time:

1 hour1 hr

Tab:

$50

Talent:

**

Tools:

E8 Torx driver, small flat head screw driver

Applicable Models:

Mercedes-Benz ML320 (1998-03)
Mercedes-Benz W203 (2001-07)

Parts Required:

New camshaft position sensor

Hot Tip:

Disconnect battery, ALWAYS

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 right side of the motor right below the right side valve cover.

Begin by disconnecting the ground on the battery. I always disconnect the battery when working on any of the cars electronic systems.

You will need to remove the air intake duct on the right side of the engine. It compresses in towards the engine and slips off the front air inlet.

With the duct off remove the front engine cover. It pulls up and away from the engine. The cover is held on by five clips and will easily come off with hand pressure.

Locate the camshaft position sensor on the front right side of the engine just below the right side valve cover. You will need to use an extremely 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 and then use an E8 Torx to remove the bolt 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.

Make sure you disconnect the ground terminal from the battery before you begin this project.
Figure 1

Make sure you disconnect the ground terminal from the battery before you begin this project.

Remove the right side duct by compressing it towards the engine (red arrow) and slipping it off the air inlet.
Figure 2

Remove the right side duct by compressing it towards the engine (red arrow) and slipping it off the air inlet.

With the duct off remove the front engine cover.
Figure 3

With the duct off remove the front engine cover. It pulls up and away from the engine (yellow arrow).

Locate the camshaft position sensor (yellow arrow) on the front right side of the engine just below the right side valve cover.
Figure 4

Locate the camshaft position sensor (yellow arrow) on the front right side of the engine just below the right side valve cover. You will need to use an extremely delicate touch when working with the connector as they tend to get really dried out and brittle.

Carefully release the connector from the sensor (yellow arrow), and using a small flat head screw driver and then use an E8 Torx to remove the bolt (red arrow) holding the sensor to the head.
Figure 5

Carefully release the connector from the sensor (yellow arrow), and using a small flat head screw driver and then use an E8 Torx to remove the bolt (red arrow) holding the sensor to the head.

Note: Mercedes-Benz, along with several other manufactures are using micro encapsulated bolts (yellow arrow) 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.
Figure 6

Note: Mercedes-Benz, along with several other manufactures are using micro encapsulated bolts (yellow arrow) 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 (yellow arrow) comes with it.
Figure 7

Remove the sensor from the head taking care that the rubber o-ring (yellow arrow) 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:
Lee Comments: After I have install the crankshaft sensor in my Mercedes, is there a crakshaft position sensor relearn I have to perform?
September 3, 2016
  Followup from the Pelican Staff: Yes, some models require a relearn using a scan tool. - Nick at Pelican Parts  
c320 rider Comments: thank you so much for this site very very helpful
my car runs fine,but i keep getting this code:
p203d-2
Angle variation of camshaft to crankshaft: Camshaft signal maximum angular variation in 'retarded' direction p1999.
do you think it's related to this sensor ??
and do we have cam adjuster magnet in this engine?? it's the same as mine m112.064 c320
thanks alot guys u rock ^^
March 30, 2016
  Followup from the Pelican Staff: I would assume it is a timing issue. Check mechanical engine timing. - Nick at Pelican Parts  
Edwards Comments: The car suddenly stooped starting after scan showed fuel too rich in the engine and the ECU needed to be changed. I parked the vehicle and ordered for a replacement of the ECU. After it was programmed and delivered it was installed bUT vehicle still refused to start. It does not even crank. Kick starter was suspected but a direct start from the engine by passing the ignition proved our earlier notion about the kick starter wrong. The vehicle started quit alright when ignition was py passed. The SAM was checked ok. The EIS was checked too but could not give actual indication if fault is from the EIS. What we did was to connect wires directly from the SAM with a swicht. Car starts when I turn ignition on and press the button. That's how am using it for now. Afterwards the car was scanned and the results were cam shaft position single sensor P0340 and P0341. What do I do as the car does not move very fast any longer and fuel consumption is high.
February 28, 2016
  Followup from the Pelican Staff: I would try to fix the no start issue first. The switch may not be recognized by the control module, from your description. Check the entire vehicle for fault codes, I bet there are theft codes stored.
- Nick at Pelican Parts
 
Edwards Comments: I use a benz c 200 kompressor. Car can not start but ignition turns on but can't crank. I just had the ECM changed. Scan shows cam shaft position sensor code p0340 and P0341. Very is very dull on the ground while in motion. Do I need a new EIS for the car.
February 28, 2016
  Followup from the Pelican Staff: it could be the sensors causing the no start. I would test them to see if the signals are missing. - Nick at Pelican Parts  
Brad Comments: Is there an article for this procedure on the C230k 4 cylinder M111 engine?
February 13, 2016
  Followup from the Pelican Staff: All the Mercedes articles are here: http://www.pelicanparts.com/techarticles/Mercedes-Benz/MBZ_Tech_Index.htm - Nick at Pelican Parts  
joe Comments: I have a 98 ml320 it take about 2 trys then it will start could the camshaft sensor be bad it's been like this for 2years
February 12, 2016
  Followup from the Pelican Staff: More likely a crank sensor would cause a no start.

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. Are there any fault codes? Once you figure out what is missing, it will be easier to diagnose.
- Nick at Pelican Parts
 
Brazenmack Comments: I don't fave a mbz scan tool but the cam adjuster could be prob it's wired cause mil stays off until I shut car off a start it back up . Is there a procedure to calibrating that
May 22, 2015
  Followup from the Pelican Staff: No calibration I know of without a tool. There may be an adaptation reset using a scan tool. - Nick at Pelican Parts  
brazenmack Comments: I got a camshaft range performance bank a or single sensor code before and after replacement I'm worried that the cam adjuster may not be right as I changed the wires and stuff
May 21, 2015
  Followup from the Pelican Staff: You may be onto something. Use a Mercedes-Benz scan tool to monitor actual and desired camshaft angle. If it is off, run an actuator test. - Nick at Pelican Parts  
brazenmack Comments: l changed my CAM Sensor Verbatem and i still got the Same Code . with MIL Come back On after shutting engine off the Starting it back up any one know of any common problems that Can cause this ? Is there Supposed to be a shim there were it bolts on with the two Allen bolts .Would damaged plug wires ause this I Need to smog this and I cant
May 7, 2015
  Followup from the Pelican Staff: Why did you replace the sensor? What code are you getting? - Nick at Pelican Parts  
Todd Comments: Do you folks recommend replacement at the same time as doing the crankshaft position sensor?
October 31, 2014
  Followup from the Pelican Staff: It's not a bad idea, due to the age of them being the same (if original). - Nick at Pelican Parts  

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