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Esp/bas

Discussion in 'Suspension, Steering & Brakes' started by Boatlon, Apr 25, 2018.

  1. Boatlon

    Boatlon Member

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    Your Mercedes:
    A140 2004
    I have searched a lot of forums to try and ascertain my fault I have on an A140 , 2004.
    Now I m not sure if the light has been intermittent before I removed the strut for a top mount replace but the steering geometry was upset but put back to where it was before and now turning the steering to full lock clockwise which is fine and then left , it triggers the light to reappear. The tracking upset by the removal of the strut and subsequently triggering the esp to come on.

    I haven't checked the tracking as yet. So maybe the that upsets
    The ESP light
     
  2. OP
    Boatlon

    Boatlon Member

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    Does anyone know of the above query I have , would it be better if I got a fault code?
     
  3. alexanderfoti

    alexanderfoti Moderator

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    Yes, sounds like you have a dodgy steering angle sensor.
     
    GLK likes this.
  4. OP
    Boatlon

    Boatlon Member

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    Easy sort ? Steering wheel off?
     
  5. alexanderfoti

    alexanderfoti Moderator

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    Not too bad usual. Airbag off, big nut in middle off, steering wheel off, then module comes out.

    I would get the the codes read before changing parts at least.
     
  6. OP
    Boatlon

    Boatlon Member

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    Code is C1140. N39 (steering angle sensor) signal open circuit
     
  7. OP
    Boatlon

    Boatlon Member

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    Does anyone know if the sensor is expensive please
     
  8. LostKiwi

    LostKiwi Senior Member

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  9. OP
    Boatlon

    Boatlon Member

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    Haha , was looking myself and found one for £30 ! Guess it’s the cheap version
     
  10. LostKiwi

    LostKiwi Senior Member

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    Mines new - is yours?
     
  11. OP
    Boatlon

    Boatlon Member

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    Used , value of car doesn’t justify that spent
     
  12. joderest

    joderest Senior Member

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    Have you tried the SAS reset, might clear fault
     
  13. OP
    Boatlon

    Boatlon Member

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    Can you explain that reset, is that different from steering reset explained earlier please.
     
  14. umblecumbuz

    umblecumbuz Senior Member

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    And before throwing bits at it, have you had the tracking reset?
    You will probably end up doing this anyway, as you suspect it might be out after your work, so why not do it first?
     
  15. joderest

    joderest Senior Member

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    Turn steering left to right three times, then drive away striaght
     
  16. OP
    Boatlon

    Boatlon Member

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    Ah yes that’s to do, and yes been through that procedure
     
  17. OP
    Boatlon

    Boatlon Member

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    Tried the lock to lock three times and drive straight to no avail.

    As the steering is straight at the moment I will check tracking , that can't be that far out to pick up the sensor calculation, however will check tomorrow , my diagnostic tells me at steering wheel sitting straight the angle sensor says 2.5 degrees so not far out.
     
  18. OP
    Boatlon

    Boatlon Member

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    Now coming up with Ecus fault as well , why would you need such an aid any way!!!Arghh
     
  19. OP
    Boatlon

    Boatlon Member

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    Oh and by the way had the mechanism off behind the steering wheel and could not see anything untoward, even checked the plug into ecu and it’s perfectly clean , I’m at a loss !!
     
  20. joderest

    joderest Senior Member

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    I think, but not sure i was told that it could only be 0.5 to 0.75 degrees out, other wise would throw up a code. The tracking has to be done with the steering wheel in the direct ahead.
     

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