Mercedes-Benz C240 (2001-2005) Engine Camshaft Position Sensor Guide
If your C240 is stalling, running rough, or won't start, a faulty camshaft position sensor is a likely and fixable problem.
- A failing camshaft position sensor is a very common issue on the C240, causing stalling, no-starts, and rough running.
- For reliable performance, choose an OEM/OES brand like Bosch or Hella; avoid the cheapest economy brands for this critical sensor.
- Replacement is a simple DIY task, requiring only an E8 Torx socket and about 30 minutes.
- The sensor is located on the front, passenger side of the M112 V6 engine.
Is Your C240 Stalling or Hard to Start?
A failing camshaft position sensor is one of the most common issues on the 2001-2005 Mercedes-Benz C240. This sensor is vital for engine timing, and when it starts to go bad, it can cause a range of problems from a simple Check Engine Light to leaving you stranded. The good news is that it's an accessible and straightforward part to replace for a DIY mechanic.
Critical Failure Warning
A complete failure of the camshaft position sensor can cause your engine to stall while driving. This can be a serious safety risk, as it results in a loss of power steering and power brakes. It is highly recommended to address failing sensor symptoms immediately.
Symptoms of a Bad Camshaft Position Sensor
When this sensor fails, your C240 will let you know. You will likely experience one or more of the following symptoms:
🎬 See a visual breakdown of common bad sensor symptoms.- Check Engine Light: This is often the first sign. A scanner will typically show a code like P0341 (Camshaft Position Sensor Circuit Range/Performance). 🎬 Watch how to diagnose and solve the P0341 error code.
- Hard Starting: The engine may crank for a long time before it finally starts, or it may not start at all.
- Engine Stalling: The engine may stall unexpectedly, sometimes when it gets hot, and may not restart until it has cooled down.
- Rough Idle and Misfires: The car may shake or vibrate at idle due to incorrect timing.
- Poor Acceleration: You may notice hesitation or a significant loss of power when you press the gas pedal.
Choosing the Right Aftermarket Sensor
When it comes to critical electronic sensors for a Mercedes-Benz, not all aftermarket brands are created equal. Forum users and experienced mechanics strongly advise against choosing the cheapest available part, as low-quality sensors are known to fail prematurely or be dead-on-arrival, leading to more diagnostic headaches. For the M112 engine in your C240, it is best to stick with known OEM suppliers or high-quality European brands.
| Brand Tier | Brands | Assessment |
|---|---|---|
| OEM / OES Tier | Bosch, Hella | Bosch is a well-known Original Equipment (OE) supplier for Mercedes-Benz. Choosing a Bosch sensor is the closest you can get to buying the part from the dealer. Hella is another high-quality German OEM supplier. These brands are the most recommended and reliable choices. |
| Reputable Aftermarket | Delphi, Standard Ignition (SMP), Beck Arnley, Bremi, Vemo | These brands have a solid reputation for producing reliable parts that often meet or exceed OEM specifications. They are a good alternative if an OEM-tier part is not available or if you're looking for a slightly lower price point without a major quality compromise. |
| Economy Tier | Dorman, Walker Products, Motorad, and others | While these brands offer a budget-friendly option, their quality can be inconsistent for sensitive European applications. Using an economy sensor on a critical system like this is generally not recommended for a Mercedes-Benz, as it can lead to repeat failures. |
Pro Tip: Check the O-Ring
The camshaft position sensor is sealed to the engine with a small rubber O-ring. Over time, this O-ring can become hard and brittle, causing an oil leak. Make sure your new sensor comes with a new O-ring, and if it doesn't, purchase one separately to ensure a proper seal. When removing the old sensor, ensure the old O-ring comes out with it and isn't left behind in the engine.
Frequently Asked Questions (FAQ)
Where is the camshaft position sensor located on the C240?
On the 2001-2005 C240 with the M112 V6 engine, there is only one camshaft position sensor. It is located on the front of the engine, on the passenger's side (right side), just below the valve cover. You will need to remove the front plastic engine cover to see it.
Is this a difficult part to replace myself?
No, this is considered an easy DIY job. It is held in by a single E8 Torx bolt. The main difficulty is that the electrical connector can become brittle with age, so it must be handled carefully. The entire job can typically be done in under 30 minutes with basic tools.
🎬 Watch this step-by-step guide to replacing your C-Class sensor.Do I need any special tools?
You will need an E8 external Torx socket to remove the retaining bolt. A small flathead screwdriver can help release the electrical connector clip. It's also a good idea to have a small pick to remove the old O-ring if it gets stuck.
Are there any recalls for this sensor?
No, there have been no recalls issued by Mercedes-Benz or the NHTSA for the camshaft position sensor on the 2001-2005 C240. Failures are considered normal wear and tear. There have been other recalls for this vehicle, such as for the sunroof, but not for this specific engine sensor.
Why shouldn't I just buy the cheapest sensor available?
Mercedes engine management systems are very sensitive. Cheaper sensors often use lower-quality materials and may not provide a clean, accurate signal to the computer. This can result in continued performance issues, a persistent Check Engine Light, or premature failure of the new part, costing you more time and money in the long run.
Helpful Videos
Technical Specifications
OEM Part Numbers: 0041530028 0041536928 0041539628 A0041530028 A0041536928 A0041539628
The M112 V6 engine in the 2001-2005 C240 uses a single, 3-pin Hall effect camshaft position sensor. It is secured by one E8 Torx bolt.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Mercedes-Benz C240: