Crankshaft Position Sensor Guide for 1998-2005 Mercedes-Benz CLK320
Stalling when hot or a no-start condition on your CLK320 often points directly to this critical, but replaceable, sensor.
- A failing crankshaft sensor is a very common issue on the 1998-2005 CLK320, typically causing stalling when hot.
- Bosch is the OEM supplier; choosing a Bosch aftermarket sensor is the most reliable option besides a genuine dealer part.
- Replacement is a common DIY job, but access is tight. The sensor is on the driver's side rear of the engine, held by one E8 Torx bolt.
- Ignoring the symptoms will eventually lead to a no-start condition that will leave you stranded.
Is Your CLK320 Stalling? It Could Be the Crankshaft Position Sensor
A failing crankshaft position sensor (CPS) is one of the most common issues for the 1998-2005 Mercedes-Benz CLK320 and its M112 engine. The symptoms often appear suddenly and can leave you stranded. The most classic sign is the engine stalling once it has warmed up, then refusing to restart until it cools down completely. This happens because heat can cause a failing sensor's internal electronics to stop working correctly.
Symptoms of a Failing Crankshaft Position Sensor
Pay attention to these signs, as they are strong indicators of a bad CPS:
- Engine Stalls When Hot: The car runs fine when cold, but stalls at a stoplight or while driving after the engine reaches operating temperature.
- No-Start Condition: The engine cranks over and over but will not fire up. This can be intermittent or happen only when the engine is warm.
- Check Engine Light: A failing CPS will almost always trigger the Check Engine Light and store a fault code, most commonly P0335. 🎬 See how to fix code P0335 on M112 and M113 engines.
- Rough Idling and Misfires: The engine may run poorly, hesitate, or vibrate excessively at idle.
- Reduced Power: You might notice the car feels less powerful or accelerates sluggishly.
A Common and Critical Failure
The crankshaft position sensor is a known weak point on M112 and M113 engines from this era. Due to its location, it's exposed to significant heat, which eventually leads to failure. It is not a matter of if, but when it will fail. Many owners and mechanics recommend replacing it as a preventive measure, especially on higher-mileage vehicles.
🎬 Learn more about how these sensors function on Mercedes engines.Choosing the Right Aftermarket Sensor
When it comes to this specific part for your CLK320, brand choice matters. You don't have to buy from a Mercedes dealer, but you should avoid the cheapest options, as they are known for poor reliability.
- Premium Aftermarket (OEM Supplier): Bosch is the original equipment manufacturer (OEM) for Mercedes-Benz for this sensor. Choosing a Bosch sensor is the closest you can get to the genuine part without the dealer price tag. It offers the best fit, performance, and longevity.
- Quality Aftermarket: Brands like Hella, Vemo, and NGK/NTK are reputable German or Japanese manufacturers that produce reliable sensors. They are a solid choice if a Bosch part is unavailable.
- Budget Brands: While many other brands are available at lower prices, their long-term reliability on a Mercedes can be questionable. Given the critical function of this sensor and the potential to be left stranded, it is strongly recommended to invest in a premium or quality brand.
Pro Tip: Check the Connector Style
Some early models may have a different electrical connector clip style. While most 1998-2005 models use a single-clip design, it's always wise to visually inspect your current sensor's connector before ordering to ensure a perfect match.
Replacement Cost for a 1998-2005 CLK320
The cost to replace the crankshaft position sensor is very reasonable, especially if you do it yourself. The part itself is not expensive, and the labor is straightforward for a mechanic with experience on these cars.
| Item | Estimated Cost |
|---|---|
| New OEM (Dealer) | $73 - $175 |
| New Aftermarket (DIY) | $34.26 - $78.96 |
| Shop Labor | $61 - $90 |
| Total Professional Replacement | $134 - $264 |
Frequently Asked Questions
Where is the crankshaft position sensor located on the CLK320?
The sensor is located on the driver's side of the engine, at the very back where the engine meets the transmission (bell housing). It is tucked away and can be difficult to see from above, so the replacement is often done by feel.
Is it difficult to replace the CLK320 crankshaft position sensor myself?
For a DIYer with some experience, this is a manageable job. The main challenge is the tight access to the sensor's location. You will need a long extension for your ratchet and an E8 external Torx socket. While some engine components might need to be moved for better access, many can complete the job in under an hour.
🎬 Watch this step-by-step DIY guide for expert tips and tricks.Are there any recalls for this part?
There are no specific recalls for the crankshaft position sensor on the 1998-2005 CLK320 with the M112 gasoline engine. A recall in 2008 (NHTSA 08V-006) did address crankshaft sensors, but it was for different models with diesel engines.
What happens if I ignore a failing sensor?
Ignoring the symptoms is not recommended. The problem will not fix itself and will likely get worse. You will experience more frequent stalling and eventually, the car will fail to start altogether, leaving you stranded.
Helpful Videos
Technical Specifications
OEM Part Numbers: 0031532828 0031532728
Location: Rear of engine on driver's side of bell housing. Retaining Bolt: E8 External Torx.
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 CLK320:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your CLK320 Stalling? It Could Be the Crankshaft Position Sensor
- Symptoms of a Failing Crankshaft Position Sensor
- A Common and Critical Failure
- Choosing the Right Aftermarket Sensor
- Pro Tip: Check the Connector Style
- Replacement Cost for a 1998-2005 CLK320
- Frequently Asked Questions
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