Your Mercedes-Benz may start and run for a short time, or until it gets warm and then it dies. Engine Cranks but no Start, Dies, Stalls, or BackfiresĪ failed crankshaft position sensor can cause your engine to stall or not start at all. Make sure that the engine cover is not loose. Place the engine cover back on top of the engine. Next push the electrical connector plug into the CPS end until you hear a click. or 7 ft-lb if you have a 3/8 torque wrench. Once you can no longer hand tighten the bolt, use the 3/8 ratchet to tighten the bolt. Place the new sensor in the crankshaft position sensor hole and hand tighten the bolt. Remove the crankshaft position sensor. You will have either an E8 or E10 bolt that holds the CPS sensor in place. Squeeze the connector and pull it away from the CPS sensor. Unplug the electrical connector from the CPS sensor. Locate the crankshaft position sensor (CPS) on driver’s side, towards the rear of engine. There are no screws that hold the engine cover in place, only four clips. Disconnect the two air tubes from the engine cover. Crankshaft position sensor for Mercedes Benz.Make sure to enter the year and model of your Mercedes-Benz to get the correct fit. 6-inch 3/8 ratchet extension An even better option would be a flexible ratchet extension.Ī new crankshaft position sensor can be ordered on Amazon for under $50.We have provided links to Amazon products if you need any of these tools. Here is a list of the tools that you will need to change the CPS on your Mercedes-Benz. It monitors the engine crankshaft position and speed and is one of the most important input sensors that is used by the Engine Control Unit (ECU).
The crankshaft position on most Mercedes-Benz cars such as E320, C240, S430, S500 is located at the back of the engine by the flywheel housing, in front of the firewall.
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You will need one to two hours to make this repair if you are performing this job for the first time.In this repair guide, we will show you how to replace the CPS yourself. The cost to complete this repair yourself is under $80 vs. To perform this repair yourself follow step by step instructions provided below. Replacing CPS sensor may fix the crank and no start conditions. Replacing crankshaft position sensor is easy, do it yourself project. If you are stuck on a parking lot and the car will not start, let the car cool down at least 30 minutes and then try again. The engine starts if you let it cool down. Other symptoms of a failed crankshaft position sensor are poor acceleration, engine vibrations, poor throttle response, bad fuel economy, hesitation, engine stalls. Starting problems are initially random, but more frequent when the engine is hot. As the crankshaft position sensor fails completely, the car will no longer start or will die when you are driving. At first, you may experience no start conditions intermittently. If you have been experiencing stalling or no start conditions, a failed crankshaft position sensor is often the problem. Your CPS may have failed if the engine cranks but it will not start.
Problems with the Crankshaft Position Sensor (CPS) on Mercedes-Benz cars are fairly common.
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