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ESP and ABS lights intermitent 451 CDI

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  • ESP and ABS lights intermitent 451 CDI

    As title, we have so far:
    changed right rear ABS sensor for genuine smart version
    changed right rear reluctor ring supplied by smart mods

    lights come on intermitently and after driving it for the first time in a while (dads car) i can hear a high pitched whining noise and beeping when applying the brake seems to be coming for the SAM or a relay possibly?

    lights can stay off for weeks at a time and then for no apparent reason come back on.

    had it on a diagnostics (not mercedes) came back with ABS sensor error which has been changed. we have friends at ashford mercedes and they said if it was not the reluctor ring then it may be a new ABS ECU/pump?? with front sensors included?? need to research this more.

    Just had MOT which needed new front tyres.

    I think we have a brand new brake switch somewhere so may try fitting that but it may be for a 450.

  • #2
    I should add that the car was running on a broken front spring for a while which was changed eventually.

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    • #3
      reluctor rings can collect metal flakes or crack from rust the system is otherwise military grade.

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