In this article, we discuss Mercedes Camshaft Position Sensor / Camshaft Hall Sensor (CAM) problems, symptoms and how to replace the CAM yourself. Replacing the Camshaft Position Sensor (also referred to as Camshaft Hall Sensor) on a Mercedes-Benz is very easy and can be completed in less than 15 minutes, assuming you have the right tools.
Symptoms of a failed Camshaft Sensor
Wondering what happens when a crankshaft position sensor goes bad? Watch the following video to find out.
If the camshaft sensor has failed you will notice some or all of the following:
- Check Engine Light – (CEL) / Service Engine Warning may turn on, and you will have a fault code related to the CAM sensor.
- Intermittent starting – This is a very common problem if the Camshaft Sensor starts to fail. You may notice the car starts fine one day and then hesitates to start the next. It could also be that the car starts fine when cold, but if it warms up, it’s hard to restart it.
- Loss of engine power – Less common but it is possible that the car may hesitate under acceleration or even trigger misfire codes. This is caused because the Electronic Control Module (ECM / ECU) does not receive any information from the CAM sensor, so it doesn’t know the crankshaft position.
Fault Codes related to Camshaft Sensor
P0340 fault code is often detected which points to camshaft position (hall) sensor fault. The problem could be the wiring or camshaft sensor itself or even the ECU.
How to replace the Camshaft Position Sensor on a Mercedes-Benz
|FEMALE E-TORX (Star) Socket Set|
You will be surprised how inexpensive a CAMshaft position sensor is. If you go to Amazon you will find CAM sensor for any Mercedes-Benz model. Visit the link below to check current prices.
|MERCEDES-BENZ Camshaft Position Sensor|
Follow these steps to replace the camshaft position sensor on your Mercedes-Benz E, C, S, CLK, ML Class and other models.
- Open the hood and locate the camshaft position / hall sensor.
- Unplug the electrical connector from the camshaft position sensor.
- Remove the bolt using E-8 Female Torx socket.
- Pull out the old camshaft position sensor.
- Install the new camshaft sensor. Ensure that the old o-ring is removed and a new one is installed.
- Tighten the bolt to 8Nm or 70 in-lbs. Connect the electrical connector and replace the engine cover if removed.
Frequently Asked Questions
How much does it cost to replace Camshaft Position Sensor (Camshaft Hall Sensor) on a Mercedes-Benz?
The cost to replace the camshaft position sensor can vary from $150 to $300 depending on the auto repair shop and your location. You could replace the camshaft position sensor yourself in less than 15 minutes and spend
What happens when camshaft position sensor goes bad?
Once the camshaft position sensor fails on your Mercedes-Benz, you may start noticing any of the following: car will hesitate to start, engine cranks but it does not start or starts after several tries, engine runs rough, engine multiple cylinder misfire and lack of power or acceleration.
Where is Mercedes-Benz Camshaft Hall Position Sensor located?
Camshaft position sensor on Mercedes-Benz cars with 6, 8 and 12 cylinder engines is located on the front of the engine toward the top, near the valve cover.
How do camshaft position sensors work?
The camshaft position sensor is an electronic device used in gasoline engines to monitor the position or the rotational speed of the camshaft. The position location is used by the engine management system (also known as ECU/ ECM) to adjust the timing, fuel injection and other engine paramenters.
Possible Solutions to camshaft position sensor problem?
First, you need to replace or ensure the camshaft position sensor is working properly. Then you can perform further diagnosis and check the following.
- Using a digital multimeter check the wires make sure there is continuity.
- Unplug the electrical connector going to the camshaft position sensor.
- Defective engine control unit (ECU) could also be the cause.
Is it CAM or CPS?
A common misconception about the CAMshaft position sensor or the hall sensor is its acronym. The correct acronym is CAM, not CPS. CPS stands for Crankshaft Position Sensor which monitors the rotational speed of the crankshaft.
How to test a camshaft position sensor?
Testing the camshaft position sensor is easy and can be completed at home using some basic tools.
Replaced camshaft position sensor but my check engine light is still on.
If you replaced the camshaft position sensor and your check engine light is still on, you may need to check if there are any other fault codes. To this you will need an OBD2 scanner. We highly recommend that you get a hold of an OBD2 scanner, some of them cost less than $20 USD. You can read this article that can help you choosing the right OBD 2 scanner for Mercedes-Benz.
These instruction will also help you if you have a newer Mercedes-Benz with V6 or V8 engine such as M272 and M273.
|M112 V6 Engine||M113 V8 Engine|
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