Cmul

Hi Y’all. I need some help. Sorry if this question has been asked and answered a millions times. I have not been able to find a solution to my problem.

Long story short. Was driving a couple months ago and my car just shut completely cut out. No warnings Just shut off and would not start or even crank. Luckily, this happened to be in front of the shop I go to so I just pushed it into their parking lot. They diagnosed it as the CPS and changed it. Before this the card had trouble starting when warm. Got the car back and warm starting issue still persisted but car functioned for the most part.

Couple weeks later was driving on the highway and a loud pop/clunk sound came from the front left side of the car and breaking would not work. Peddle would go to floor. Used parking break. Pulled over, restarted the car, brakes were fine again. Used car sparingly but starting the car kept getting more and more difficult until it would not start. Changed the battery. Starts running great for about a month until I am at a stoplight. Loud groaning sounds starts from right rear. Goes on for about 30 seconds. Then car just shuts completely off again. No codes. I replaced the multi purpose and fuel pump relay with no luck. Fuse is good. Car now cranks hard but just does not start. Attached is a video of the start. Any help would be appreciated.

fazxs

I had the the issue of crank and no start when the weather is warm outside. I lived with this issue for over a year. It was weird and I checked for a solution with a Mercedes dealer and a Specialist. They couldn’t figure out the issue and recommended change of starter motor. I just changed the CPS. The issue persisted and my car wouldn’t start in hot weather when parked outside. It would crank with a single click sound and no start. I would try multiple times to crank and finally would start.

During my last service, I replaced the engine oil level sensor to fix another issue. Since then my car starts perfect. I’ve driven over 3000km since without any issues. I can’t say that the oil level sensor will fix the issue but in my case it fixed the issue and I can confidently say the starting issue never occurred again. I live in UAE and it gets pretty hot here and the car just starts fine when parked outside.

Yuille36

I'm know E55 expert. But what typically happens is, your oil level sensor detects low oil, it can shut the car done, to prevent engine damage. Or tell you to add a quart.