How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Marty Your Own Question

Marty
Marty, Bosch Certified Master Technician
Category: Car
Satisfied Customers: 53314
Experience:  Bosch Certified Master Technician with over 35 years experience in the automotive industry.
13230946
Type Your Car Question Here...
Marty is online now

Mercedes c230k 2001 Occasional sudden engine cutout when driving

Customer Question

Mercedes c230k 2001
Occasional sudden engine cutout when driving - problem looked at but not resolved
Any clues?
restarts if travelling fast but slowing down or at lights it stalls
Frequency of occurrence: once in every hour of travel (roughly)
Submitted: 2 years ago.
Category: Car
Expert:  Marty replied 2 years ago.
Hi, my name isXXXXX you know exactly which part was replaced for this problem?
Customer: replied 2 years ago.

yes the engine sensor -

Expert:  Marty replied 2 years ago.
Ok, could you mean the crankshaft position sensor?
Customer: replied 2 years ago.

Yes I expect so.

Expert:  Marty replied 2 years ago.
Ok, does the car turn off suddenly as if the key was turned off or does it gradually die as if it were running out of gas? Does the car restart immediately or do you have to wait a few minutes before it will restart? Also, are the symptoms exactly the same since the sensor was replaced?
Customer: replied 2 years ago.

Sudden switch off. Starts quite promptly since we also had a fuel leak


repair carried out a couple of months ago.


(sorry for delAY IN REPLYING got cut off)

Customer: replied 2 years ago.

sudden cutout Satisfactory restart fairly promptly


 

Expert:  Marty replied 2 years ago.
Ok, to be honest with you this sounds most like a faulty crankshaft position sensor. The sensor is notorious for intermittently cutting out and causing sudden stalling. If an aftermarket crankshaft position sensor was installed I would be even more suspicious of the sensor intermittently cutting out. Other problems that can give a similar symptom are a faulty fuel pump or fuel pump relay or ignition switch but the crankshaft sensor is the number one cause of this type of symptom. I would check to see which sensor was replaced and whether it was a genuine Mercedes sensor or an aftermarket type. I'd also get the car connected to a Mercedes scan tool to see if there are any fault codes stored that point to the problem. Often when the crank sensor fails intermittently it does not leave any fault codes. Replacing the crankshaft sensor with a genuine Mercedes sensor would be my advice.

Let me know if you have any questions.

Marty
Marty, Bosch Certified Master Technician
Category: Car
Satisfied Customers: 53314
Experience: Bosch Certified Master Technician with over 35 years experience in the automotive industry.
Marty and other Car Specialists are ready to help you

What Customers are Saying:

 
 
 
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
< Previous | Next >
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex
 
 
 

Meet The Experts:

 
 
 
  • Greg

    Greg

    Technician

    Satisfied Customers:

    1067
    Automotive diagnostic tech
< Previous | Next >
  • http://ww2.justanswer.com/uploads/IN/indytech/2013-8-8_102717_SantoDomingo146598x6402.64x64.jpg Greg's Avatar

    Greg

    Technician

    Satisfied Customers:

    1067
    Automotive diagnostic tech
  • http://ww2.justanswer.com/uploads/35/350matt/2012-6-7_182356_matsavatr.64x64.jpg Matt's Avatar

    Matt

    Mechanical Engineer

    Satisfied Customers:

    4197
    BEng hons Mech engineering, in auto industry 22 years
  • http://ww2.justanswer.com/uploads/TE/techmachine/0601821347169_717372168_8940977_39623330_o.64x64.jpg Ross's Avatar

    Ross

    Diagnostic and repair technician

    Satisfied Customers:

    452
    Licensed diagnostic and repair technician
  • http://ww2.justanswer.com/uploads/RO/RobMechanic/068.64x64.JPG Rob's Avatar

    Rob

    ASE Certified Technician

    Satisfied Customers:

    82
    30 years trade experience
  • http://ww2.justanswer.com/uploads/UK/ukiaibal/2012-11-9_205920_SAM0109.64x64.JPG uk_iaibal's Avatar

    uk_iaibal

    UK Car Mechanic

    Satisfied Customers:

    1
    Verified Car Mechanic.
  • http://ww2.justanswer.com/uploads/NA/nabilc/nabilc_avatar.64x64.jpg Billy's Avatar

    Billy

    Trainer/ Master Technician

    Satisfied Customers:

    38
    Trainer 8+ years, master tech. 10+ years, SAE member
  • http://ww2.justanswer.com/uploads/MI/mikeamechanic/2013-4-2_175558_photo.64x64.JPG Mike Kelly's Avatar

    Mike Kelly

    Auto Service Technician

    Satisfied Customers:

    1256
    17 years experience as an auto mechanic, foreign and domestic. 5 years running my own repair business.