Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hi, you need to get the fuel pressure tested and test for spark when the car will not start. The crank sensor is common but a bad fuel pump or fuel pump relay or even a bad ECU can cause this problem. You need to find out whether you are lacking fuel or ignition when the car won't start and troubleshoot from there.
Let me know if you have any questions.