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abs light

Discussion in 'A6/S6/Allroad forum (C5 Chassis)' started by abdul h ghafoor, Jun 2, 2012.

  1. abdul h ghafoor
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    abdul h ghafoor Member

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    Got in car today and abs light is on permanently. I switch ignition of and wait and light still on permanently. My car is an a6 2.5 tdi Quattro auto. Any suggestions?
    #1
  2. marty.h
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    marty.h Member

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    you will have to get the car plugged in on vag com or something like that to retrieve the fault codes once you have them you will have something to go by.

    Make sure once you have jotted the codes down clear them and see what if any returns strait away or you will be chassing your tail if you have loads of stored codes
    #2
  3. boost-addict
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    boost-addict Member

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    is there 3 bleeps after igntion is switched on?

    possibly a wheel sensor. but vcds is best way to be sure.
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  4. abdul h ghafoor
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    abdul h ghafoor Member

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    Well I decided to check the abs wheel sensors. The front o/s looks ,worn, and is,also cracked. Sourced one from eBay for 13 quid when it arrives a comp next week. Will update.will fit. Also is getting hooked to
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  5. DONNYDARKO
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    DONNYDARKO New Member

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    The ABS sensors can be tested with a multimeter. Set the meter to millivolts ,connect both leads to the pins in the connector and turn the wheel. a good sensor should read a voltage as the wheel turns past it.
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  6. murran
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    murran Active Member

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    youd need an osiliscope to do this check that way.

    just get the car scanned for faults. then you can pin point where the fault is.

    you can buy vag com, or go on the vag com section of the forum and see which member is nearest you that has it, pm him offering beer money to help you. if its a sensor fault, he can also check the sensor signals via actual values as your driving.
    #6
  7. Dalton
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    Dalton New Member

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    It needs to be plugged into a scanner/code reader to know exactly what part triggered the problem.

    ____________________
    vcm ids software
    #7
  8. fishyfish
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    fishyfish Member

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    If the sensor turns out to be ok, might be an idea to get the car up on a hoist and check if any wheels have been buckled from a pothole/kerb impact... although you would probably feel nasty vibrations etc as you drove along if it was an obvious physical failure like that.
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  9. marty.h
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    marty.h Member

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    A buckled wheel would not cause the ABS light to come on as the ABS ring will be on the shaft and for that to move it would have to do the wheel bearing and you would hear that had gone if it was bad enough to trip the ABS
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  10. TwistedMind
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    TwistedMind Long Live The A6

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    Make sure the ABS sensor is located right, if its sitting in the wrong position it will cause a fault (had this problem before)
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  11. fishyfish
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    fishyfish Member

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    Fairy nuff. Just throwing it out there as I vaguely remember hearing of an instance (admittedly not an A6) where a couple of buckled wheels were enough to confuse the ABS sensors... but you are right in that if it was mechanical, it would have to be severe enough to feel/hear something.

    As you were!
    #11
  12. abdul h ghafoor
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    abdul h ghafoor Member

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    Thanks for all the advice. Waiting for. Vag com check first then will update
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  13. boost-addict
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    boost-addict Member

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    have you tried just removing the sensor, make sure theres no crud on the ring or sensor and then checking with a multimeter
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  14. abdul h ghafoor
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    abdul h ghafoor Member

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    Got it hooked up to a vag comp and low and behold the abs sensor front passenger side. Replaced and hey Ho abs light gone.
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  15. boost-addict
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    boost-addict Member

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    Well not a bad fix. Was your car bleeping 3 times or just the light?
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  16. abdul h ghafoor
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    abdul h ghafoor Member

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    No bleeping just the abs light was on so fell lucky I suppose that abs unit a ok.
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