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S320 Bizarre speedo and odometer fault

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by Pebbles28, Aug 21, 2018.

  1. Pebbles28

    Pebbles28 New Member

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    Joined:
    Aug 21, 2018
    Your Mercedes:
    S320, 2009
    Hi,

    Apologies if this is in the wrong section. My mum’s S320 has been playing up, it’s about 9 years ago (I will confirm full details when she gets them to me). It has an intermittent fault where she will be parked, but the speedo will show max speed and the odometer will be increasing. It is quite bizarre and not something I thought would be possible.

    Does anyone have any idea what could be going on, how it can be fixed, and if there is any redress for the additional miles put on as a result?

    Thanks very much.

    Ronald
     
  2. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Joined:
    Mar 25, 2010
    Location:
    Tonbridge
    Your Mercedes:
    W221 S65 AMG - W204 C63 AMG + Various other MB's
    One or more wheel speed sensors are probably faulty, or the ABS ring in the hubs are rusted.

    Probably NSF as that one does the speedometer.

    I would change them all, as others will be not far behind, but up to you.

    The additional miles on the odometer will be minuscule, I cannot imagine more than 10-20 miles.
     
  3. OP
    Pebbles28

    Pebbles28 New Member

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    Joined:
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    Your Mercedes:
    S320, 2009
    Thanks for the reply. It is adding a mile approximately every 10 seconds, so it must think the car is doing c. 360mph! I’ll tell my mum and hopefully that will sort it!
     
  4. Flyinspanner

    Flyinspanner Senior Member

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    Joined:
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    Location:
    Ruislip
    Your Mercedes:
    CL500 -W215, A140-W168 CLK320-A209
    Get it to a local Indie, and get codes read on STAR.
     

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