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 Robert Your Own Question

Robert, UK Qualified Car Technician
Category: Car
Satisfied Customers: 4540
Experience:  Fully qualified / self employed garage technician in the UK
Type Your Car Question Here...
Robert is online now

I get a problem with my Citroen 2002 C5 -if it gets oil on

Customer Question

I get a problem with my Citroen 2002 C5 -if it gets oil on the engine rotating sensor it can stop the car - when that gets cleaned i still get it stopping suddenly - it can happen in a change down situation or for no known reason - one time a main dealer said it was sludge in the tank and charged me for cleaning it out - my own garage says its not the fuel pump because it would stop and not go again -- sometimes if it stops i get the impression if i let it settle it will start after an hour and i can get home but that could be oil on the engine rotation sensor just dripping off.
Have you any experience of this
Submitted: 7 months ago.
Category: Car
Expert:  Robert replied 7 months ago.


Engine rotating sensor?? You mean the crank position sensor?

Has any of the garages in question actually recommended dealing with the oil problem?

Any engine warning lights come on prior to the car cuttng out?

Customer: replied 7 months ago.
no it happens suddenly - i have just had the sensor cleaned - when the sensor is dirty I only get a few yards or half a mile driving and have to flatbed it to my garage - now with it cleaned the problem is intermittentfor example on two occassions over the past few days - i had driven about 3 miles from my house and it cut out near the same bridge so that time the problem was time or distance related - i just started the car again and it went okthe oil problem is some stray oil from an oil leak near the rocker cover which i have cured i hopeI dont get enough time to see warning lights if they occurrthe blogs are full of the same problem and causes ranging from coil over heating , to faulty connections in the fuse board not supplying correct voltage to the sensors , to EGR? valve (i dont know if theres one in my petrol car)
one guy said he drilled a hole in the thermostat and put the fan on permantely and that solved his problemI have the car 6 years - it also used to stop generally once on a long journey (150 miles) when i changed down in traffic but it always started again after a few minutes - there would be a noticeable loss of power for a minute or two as i tried to get it going again1.
Expert:  Robert replied 7 months ago.


To me its sound like a faulty crank or cam sensor dropping out..this can cause stalling,loos of spark or injector pulse..the only way to know that or to get the car scanned as the fault happens..this means obviously driving the car whilst its on live data to watch each sensor or capture the event at which the fault happens..that means you'll be able to narrow it down further and take nessesary steps to resolve the issue..with the oil issue it possible that oil has got into the contacts on that sensor or internally and no doubt causing the fault or has continued tat being said id say by the sounds the fault its either the crank or the cam sensor at fault...I do hope this helps

Customer: replied 7 months ago.
i would probably get an auto elec to trace the sensor and wiring back to the fuse board and look at all conections as wellI cant predict when it would happen again - i would have to buy a scanner and leave it permantely connected -its probably an expensive item - do you know of a scanner that would do the job and i wil look at itthe other approach might be to look at resistances in the sensor circuit and see if something pops upthanks
Expert:  Robert replied 7 months ago. cant do any checks unless you know what sensor or component is at do live data or capture the event will need a high end dont have to have it permantely plugged by what you have said the fault occurs often at certain times when the cars in that case any good local auto tech or electrician can do that can cheap handheld scanners to help id fault codes that might be stored..Autel do some good hand may want to look at either on ebay..but avoid chinese copies or machines sent from that region...

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!
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, 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



    Satisfied Customers:

    Automotive diagnostic tech
< Previous | Next >
  • Greg's Avatar



    Satisfied Customers:

    Automotive diagnostic tech
  • Matt's Avatar


    Mechanical Engineer

    Satisfied Customers:

    BEng hons Mech engineering, in auto industry 22 years
  • Ross's Avatar


    Diagnostic and repair technician

    Satisfied Customers:

    Licensed diagnostic and repair technician
  • Rob's Avatar


    ASE Certified Technician

    Satisfied Customers:

    30 years trade experience
  • uk_iaibal's Avatar


    UK Car Mechanic

    Satisfied Customers:

    Verified Car Mechanic.
  • Billy's Avatar


    Trainer/ Master Technician

    Satisfied Customers:

    Trainer 8+ years, master tech. 10+ years, SAE member
  • Mike Kelly's Avatar

    Mike Kelly

    Auto Service Technician

    Satisfied Customers:

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