w124 e220 external temperature sensor issue

Discussion in 'Electronics' started by adile220, May 5, 2015.

  1. adile220

    adile220 Hardcore MB Enthusiast

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    Hi all

    Can someone enlighten me on the job of the external temperature sensor on the w124 - I have been told it is linked to the gearbox somehow?

    Also - I need to replace mine as apparently it is missing.

    Where are they located on the car - is it best to go main dealers for a replacement?

    It is a 1996 car.

    Best

    Adil
     
  2. bolide

    bolide Hardcore MB Enthusiast

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    Not all cars had it fitted. It sits behind the front number plate and the display is at the bottom of the binnacle

    There's no link to the gearbox AFAIK

    Nick Froome
     
  3. kingdave

    kingdave Hardcore MB Enthusiast

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    Isn't there another temperature sensor in the lambda/o2 probe which keeps the car in a low gear for a minute or so after startup?
     
  4. grober

    grober MB Club Veteran

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    The later versions of the e220 coupe had the external temperature readout deleted as a money saving issue. Retrofit is possible but you will need 1. the sensor [ behind the bumper as previously mentioned] 2. the connecting lead to 3. the readout display unit which is mounted in the instrument binnacle.
     
  5. OP
    OP
    adile220

    adile220 Hardcore MB Enthusiast

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    Last edited: Mar 11, 2016
  6. grober

    grober MB Club Veteran

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    The digital readout 58.0 C !!!under the speedometer dial-yes
     
  7. OP
    OP
    adile220

    adile220 Hardcore MB Enthusiast

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    Hi grober

    Yes - the temperature readings are well off.

    Not sure what to do - replacement sensor?

    Regards

    Adil
     
  8. grober

    grober MB Club Veteran

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    Last edited: May 9, 2015
    1 person likes this.
  9. OP
    OP
    adile220

    adile220 Hardcore MB Enthusiast

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    Thanks all

    Could it have an effect on how the car idles?

    Have recently noticed when stopping to a halt it lurches forward - like the revs are not dropping to idle speed.

    Best

    Adil
     
  10. bolide

    bolide Hardcore MB Enthusiast

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    I don't think so. The OTG shows the external temperature which isn't very relevant to the engine. The engine has two temp sensors to feed the instruments & ECU, and the ECU also sees data from the lambda sensors, CPS, etc, etc, all of which is relevant to the engine

    220s tend to suffer from throttle body problems - if t's not idling properly, remove the rubber boot to the TB and clean the butterfly valve & housing very carefully with carb cleaner & a clean rag

    Nick Froome
     
    1 person likes this.

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