w203 Oil In loom Please help

Discussion in 'Engine' started by alexdyer, Oct 4, 2011.

  1. alexdyer

    alexdyer New Member

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    Hi there I am new to this forum as of today and am after some help.
    I have a w203 2006 c180 kompressor
    I have had the engine light come up on the dash without any effects whatsoever to engine performance or operation.
    I read the codes and it came up with P200b exhaust cam hall sensor. reading some threads about this I feared the worst about leaking cam hall sensors and loom damage.
    I looked in the loom and oil had reached the ecu also.
    I have replaced the entire engine loom and the sensors and still cannot get the code for the cam hall sensor to dissappear!
    the code will be away until the engine is started , it holds it as a pending code and then turns to a stored code after the ign is cycled!
    I have opend the ecu up, which took forever! and could not see any oil contamination on the board , however I fear that if it has got in there I cannot see it as it would be on the other side of the circuit board that I cannot access.
    Does anynone have any experience with this at all?
    Could I have missed something?
    I am ope to any offere of help.
    Kindest regards
    Alex
     
  2. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

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    This fault code "can" be related to a stretched timing chain.

    It is best to check the engine timing first and the sensor on a scope.
     
  3. OP
    OP
    alexdyer

    alexdyer New Member

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    I have changed the sensor for a new one and have also swapped them around and still nothing!
    I will check the timing tomorrow.
    How many degrees should it be?
     
  4. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

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    Not sure unless I look it up.

    Whats the first six number of your chassis.
     
  5. OP
    OP
    alexdyer

    alexdyer New Member

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    I will check when I get home in an hour or so.
    talk in a bit
     
  6. OP
    OP
    alexdyer

    alexdyer New Member

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    wdb203
     
  7. OP
    OP
    alexdyer

    alexdyer New Member

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    Is that what you meant? Or the six after the letters,? If so wdb203746
    Thank you alex.
     
  8. horgantrevor

    horgantrevor MB Enthusiast

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    when you replaced the loom did you fit blockers to stop it happing again

    i had a car do this recently and the timing chain had to be replaced it was stretched so much it was like a banana its a single timing chain and they are know to do this (stretch)
     
  9. OP
    OP
    alexdyer

    alexdyer New Member

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    I haven't as yet fitted the blockers. A friend is picking me up what he called pigtails and also some sort of grommet.
    I am wIting on someone to give me the timing info so that I can check it tomorrow to see if the chain is stretched.
    Is there another way of checking without dismantling ?
     
  10. horgantrevor

    horgantrevor MB Enthusiast

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    yes some people may call them pig tails but they just stop the oil traveling down the new loom

    as for the timing chain you may hear it and also the code you got kinda says it all

    im afraid
     
  11. OP
    OP
    alexdyer

    alexdyer New Member

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    The engine sounds sweet with no rattles or clicking or anything!
    That was why I was going down the electrical route.
     
  12. OP
    OP
    alexdyer

    alexdyer New Member

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    Also the engine has only done 50 k with service history.
     
  13. horgantrevor

    horgantrevor MB Enthusiast

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    its a 271 engine they are well know for this trouble

    i have seen many w203 w209 and others with the 271 engine with this fault and others

    in my opinion the worst engine ever for mercedes and they know it
     
  14. OP
    OP
    alexdyer

    alexdyer New Member

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    Any ideas of the price of a new chain?
     
  15. horgantrevor

    horgantrevor MB Enthusiast

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    ok from otto in ireland german car parts supplier 140 euro for chain and two tensioner's

    one seal also needed for timing chain cover

    you may need to change the thermostat also but you will know that when you take out he old one

    i have just rang a friend who is a head mechanic in ireland for MB and with that code dont drive the car as you will do more damage that is what he said

    on the code P200b exhaust cam hall sensor

    which you have i hope this helps


    you also have to factor in coolant
     
  16. OP
    OP
    alexdyer

    alexdyer New Member

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    Hi thanks for the info. I am going to order the chain and kit tomorrow .
    If anyone has any tips on the replacement I am very open to the advise.
     
  17. OP
    OP
    alexdyer

    alexdyer New Member

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    Can anyone give me the information on how to loosen the tension and then retension the cam chain tensioner after chain replacement?
     
  18. grober

    grober MB Master

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  19. OP
    OP
    alexdyer

    alexdyer New Member

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    Hi thanks for the link however I cannot see the info I need. I have started another thread asking for replacement procedure of the chain.
    Thank you once again
    Alex
     
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