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MB Paul
MB Paul, Mercedes Technician
Category: Mercedes
Satisfied Customers: 3567
Experience:  Qualified Mercedes Benz Diagnostic Technician - 20+ years experience - Workshop Foreman for Mercedes
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Pete, looking solution 2007 R350. Changed CPS, engine

Customer Question

Hello Pete,
looking for a solution for my 2007 R350.
Changed CPS, engine starts, warms up, turn key off and it will not start till it cools down again. fuel pump relay?
Submitted: 1 year ago.
Category: Mercedes
Customer: replied 1 year ago.
or fuel pump? CPS = crank shaft position sensor,
Expert:  Lou P. master tech replied 1 year ago.

Sorry for the delay. This is not a common issue. Does the car crank but not start when the issue occurs?

Expert:  Lou P. master tech replied 1 year ago.

Also does the engine ever die? Why did you replace the crank sensor ?

Customer: replied 1 year ago.
Car will start when engine is cold, will run fine, shut off, then will not restart until motor cools down. Replaced crank shaft position sensor because this is a common issue around the 80,000 mi point with Mercedes.
Expert:  Lou P. master tech replied 1 year ago.
Ok fair enough thanks for replying I appreciate the info. So did you ever get a check engine light ? And when it does not start does it crank at all ?
Also when this happens I need you to turn the key on and note everything in the car that does not work. Try every button and switch you can. How often does this occur ?