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On average, the cost for a Mercedes-Benz 420SEL Camshaft Position Sensor Replacement is $327 with $173 for parts and $154 for labor. Prices may vary depending on your location.
| Car | Service | Estimate | Shop/Dealer Price |
|---|---|---|---|
| 1991 Mercedes-Benz 420SELV8-4.2L | Service typeCamshaft Position Sensor Replacement | Estimate$516.60 | Shop/Dealer Price$610.06 - $874.83 |
| 1990 Mercedes-Benz 420SELV8-4.2L | Service typeCamshaft Position Sensor Replacement | Estimate$506.69 | Shop/Dealer Price$596.74 - $858.97 |
The camshaft position sensor monitors the position of the camshaft and reports that data to the car’s onboard computer system. This computer system works with sensors and other devices to keep the engine running. With data from the camshaft position sensor (CPS), the fuel injectors know when to fire.
When the sensor malfunctions, the computer does not know when to fire the injectors and may not fire them at all. The faulty readouts may also throw off spark timing, which will affect the car’s fuel economy. This sensor is used in conjunction with the crankshaft position sensor to control ignition timing. It is common for heat and oil leaks to cause this sensor to fail, due to where the sensor is located.
The camshaft position sensor isn’t checked in most regular services, but your vehicle has warning signs for when the sensor begins to fail. Because it sends information to the camshaft, when the sensor begins to fail your engine will begin to have trouble. Your engine may have a hard time turning on, staying on, idling, or running smoothly. Your Check Engine warning light should illuminate as well.
The camshaft position sensor provides valuable information about the camshaft position to the computer management system. The computer system uses the information from the position sensor to determine when to inject more fuel. Without the sensor’s information, the computer won’t inject fuel properly, and your vehicle will stall or sputter.
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