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W210 MAF Problem

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Alf G, Dec 14, 2012.

  1. Alf G

    Alf G Member

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    Joined:
    Dec 1, 2012
    Location:
    Welling Kent
    Your Mercedes:
    E240/2000/112914
    Having fitted a new MAF sensor I am still having problems with the running & performance of my car. Does anyone know if the plug-in connector on these cars give problems. Any info would be apreciated.
     
  2. Alex Crow

    Alex Crow Senior Member

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    Location:
    Super Suffolk
    Your Mercedes:
    W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
    Assuming you mean the plug at the MAF sensor, no, they do not give problems.

    Are you still getting a MAF sensor fault code??
     
  3. OP
    Alf G

    Alf G Member

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    Joined:
    Dec 1, 2012
    Location:
    Welling Kent
    Your Mercedes:
    E240/2000/112914
    The codes P2006 B17/8 Right Charge Air sensor, short circuit to positive or open circuit P0112.
    P2004 B2/5 Hot Film MAF sensor, check sensor signal voltage P0101.
    These codes have been present and cleared but have returned again. I was suspecting a fault in the wiring at the plug on the MAF
     
  4. Alex Crow

    Alex Crow Senior Member

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    Joined:
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    Location:
    Super Suffolk
    Your Mercedes:
    W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
    I have 2x questions...

    Was it a genuine Bosch MAF sensor?
    What are you reading the fault codes with? (the definitions are not quite right)

    Any pattern sensor will always give trouble, so if it is a cheapy, replace with Bosch (cheapest from carparts4less, http://www.carparts4less.co.uk/engine-management-sensor )
    Also, do check the wiring from sensor to ECU for chafes and pinches etc.
     
  5. OP
    Alf G

    Alf G Member

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    Joined:
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    Location:
    Welling Kent
    Your Mercedes:
    E240/2000/112914
    I am using a Snap-on Verlis diagnostic machine. The MAF I bought from Eurocarparts and is made by Bosch. I even emailed Bosch to ask if the ECU on my car would read this part correctly and they assured me that it should all be ok. I will check the wiring when, and if it stops raining!! Thanks for your help.
     
  6. Alex Crow

    Alex Crow Senior Member

    Messages:
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    Joined:
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    Location:
    Super Suffolk
    Your Mercedes:
    W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
    What live data do you get for MAF sensor voltage with engine not running, and at idle?

    What live data do you get for intake air temp values?

    Have you any other codes being logged?
     
  7. OP
    Alf G

    Alf G Member

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    Location:
    Welling Kent
    Your Mercedes:
    E240/2000/112914
    Hi Alex,
    I am unable to determine the voltages at the sensor as I haven't got the leads for the Verus. Looking through the diagnostic machine it does say to take back probing readings with the plug connected but I can't see how to get those readings without possibly breaking the sensor plug. Sadly a little knowledge is dangerous!! Thanks for your help though, it is much apreciated.
     

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