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Marty, Mercedes Technician
Category: Mercedes
Satisfied Customers: 53901
Experience:  Bosch Certified Master Tech. Over 35 years experience.
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Starts when start after car is driven. Replaced

Customer Question

Starts when start after car is driven. Replaced crankshaft position sensor still wouldn't start. Sat overnight started fine, drove car about five miles turned off wouldn't start
JA: Does the vehicle stall at low speeds? Does it sputter?
Customer: No
JA: What is the model/year of your Mercedes?
Customer: Built September2006
JA: What year is your Mercedes?
Customer: Built September2006
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: Took it to a shop they replaced crankshaft sensor per my request did not do diag
JA: Anything else you want the mechanic to know before I connect you?
Customer: Vehicle shifted into first gear a few times I don't know if it was me hitting the shifting paddles on steering wheel by accident or the car malfunction
Submitted: 8 months ago.
Category: Mercedes
Expert:  Marty replied 8 months ago.

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.