HomeAutomotiveMercedes Crankshaft Position Sensor Failure: Causes and Solutions in USA

Mercedes Crankshaft Position Sensor Failure: Causes and Solutions in USA

Mercedes is one of the finest brands that provides luxury excellence and innovation in its vehicles. Due to its innovative technology, dealing with engine problems can sometimes be challenging. The most common issue Mercedes drivers face is crankshaft position sensor failure.

The crankshaft position sensor is a device that monitors internal combustion. The failure of this sensor can affect the performance of the car. To avoid any harm to the engine, get your vehicle checked by a well-reputed European auto repair shop.

What is a Crankshaft Position Sensor?

The crankshaft position sensor (CPS) is a device typically belonging to the engine with internal combustion (ICE) of the majority of modern vehicles. Specifically, the crankshaft position and angular speed are observed and sent to the engine control system for corrections. An essential parameter for engine execution is the crankshaft position and speed, and failure to receive an accurate signal from the crankshaft position sensor will cause some engines not to function.

The crankshaft position (CKS) sensor is a vital component of an automobile engine. It provides a better power economy and allows for a more effortless driving experience. The crankshaft sensor seldom fails, but it really cannot be called invincible.

Symptoms of Crankshaft Position Sensor Failure:

The correct diagnosis and repair of that malfunctioning crankshaft position sensor is highly dependent on one recognizing the signs of a failing crankshaft position sensor. Common symptoms include:

  • Rough Idling: If the sensor doesn’t provide real-time recordings, the ECU will find it challenging to keep the idle smooth, resulting in rough or erratic engine behavior.
  • Stalling: A falsified crankshaft position sensor is likely to result in an unintended engine stalling, mainly when you are throttling up or decelerating suddenly.
  • Difficulty Starting: Faulty sensors may prevent the engine from functioning and take longer to ignite.
  • Poor Fuel Efficiency: This is the reason for the ineffective fuel injection and ignition timing, which is the main reason for the user having low fuel efficiency.
  • Check Engine Light: The check engine light can be caused by a bad crankshaft position sensor, which will illuminate the dashboard.

Causes of Crankshaft Position Sensor Failure

Overheating Engines

The crankshaft sensor may fail, and the engine may overload, which causes the temperature to rise. While the engine will most probably be designed to live with high temperatures and, therefore, will incorporate parts to withstand such temperatures, there are plenty of components that will break if the cooling system of the engine cannot keep on with the heat output. Excessive heat during engine operations affects crankshaft sensor performance, and its durability is eventually compromised.

Sometimes, a sensor exposed to high temperatures cannot keep up with the heat and begins to malfunction. Reducing the heat in the ignition area of the engine will help the sensor operate for more extended periods.

Shorted or Defective Circuits

The crankshaft position sensor can also malfunction if the circuit’s connecting wires are damaged or the engine ground is poor. Circuits must be safe and operational at all times to perfect the process of locating sensors and passing signals on to engines.

The sensors will be disrupted as circuits designed imperfectly would not be able to pass the signals on. The signal output starts deteriorating after a while, and you will probably be using a bad sensor.

Age and Wear

Like many other electronic parts, crankshaft position sensors can lose their strength and accuracy over time due to exposure to heat, vibration, and other elements.


Soils, crud, and other types of grime can pile up on the sensor and throw off the readings or create an electrical short.

Solutions to Crankshaft Position Sensor Failure

Addressing crankshaft position sensor failure in your Mercedes requires a systematic approach to diagnosis and repair. Here are some potential solutions:

  • Diagnostic Testing: A qualified technician can use diagnostic tools to evaluate the crankshaft position sensor’s functionality and identify any underlying issues.
  • Cleaning or Replacement: In some cases, contamination or debris may be causing the sensor to malfunction. Cleaning the sensor or replacing it with a new one can restore proper operation.
  • Wiring Inspection: Inspecting the wiring harness and connectors for damage or corrosion and repairing or replacing any faulty components can help ensure a reliable electrical connection.
  • Software Update: In some cases, updating the engine control unit (ECU) software may resolve compatibility issues or improve sensor performance.
  • Professional Repair: If DIY solutions are not effective or if the sensor is found to be faulty, it is recommended that you seek professional repair or replacement from a qualified mechanic or dealership.

Preventive Maintenance:

To minimize the risk of crankshaft position sensor failure in your Mercedes, consider implementing preventive maintenance measures such as:

  • Regular Inspections: Perform a regular visual inspection of the crankshaft position sensor of your car, and you will see whether it is showing signs of damage or wear.
  • Quick Repairs: Oil leakages or electrical issues can contaminate or damage sensors, so fix them instantly.
  • Quality Parts: When installing a new crankshaft position sensor, choose OEM or aftermarket components that are branded as top quality as a mechanism for assuring reliability and long-term usage.

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