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ABS Fault!

Discussion in 'General Technical / How To' started by Quattro john, Jun 14, 2007.

  1. Quattro john
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    Quattro john New Member

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    [Jun 14, 2007]
    Hi,
    I have a 99 a4 quattro and the abs light comes on when you get to 75mph and hold it there for 2 mins,no other time does this happen. Checked with vag com and it said front right hand sensor.I then replaced the sensor ,cleared the fault code but still the light comes on under the same condition and vag com says the same thing front right hand sensor.Any ideas?
    All the best John.:aggressive:
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  3. Emmo
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    Emmo Member

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    [Jun 14, 2007]
    sounds like you have a dodgy sensor,you will need to replace the abs sensor , i had an abs light on the dash and vagcom told me it was the front right sensor, I replaced it and the fault went away.
    I got the sensor for about £13 and its easy to replace, take off the wheel and its located just behind the brake disc, unplug the connector, the sensor is just held on by one allen bolt, replace with the new sensor, plug it back in and wheel back on, clear the fault and your good to go.
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  4. WHITEY_1
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    WHITEY_1 Member

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    [Jun 14, 2007]
    £13 for a abs sensor i paid £69 for my old audi a4 and that was on a N 1996 Where did you get it so cheap?
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  5. Quattro john
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    Quattro john New Member

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    [Jun 15, 2007]
    Thanks for the reply. I have replaced the sensor ,cleared the code and then tried again. The fault still comes up as front right sensor. I bought the sensor from Audi and they checked it and said there was nothing wrong with the new sensor. Are you sure that the sensor is held in with an allen bolt?
    Cheers John.
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  6. Caesium
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    Caesium My BM is fixed!

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    [Jun 15, 2007]
    maybe its the connection, look all along the wiring carefully to make sure there is no breaks. Was there any crud in the hole where the sensor fits?
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  7. Quattro john
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    Quattro john New Member

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    [Jun 15, 2007]
    I cleaned out the hole before fitting the new sensor. Surely if the wiring was faulty the fault would be there all the time. This only happens when you sit at 75mph for more than 2 mins.You can accelerate up beyond 75 and come back down ,and no problem. However sit a 75mph for 2 mins and the abs light comes on.Check with vag com and always front right sensor. Any ideas?
    Cheers John.:keule:
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  8. Caesium
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    Caesium My BM is fixed!

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    [Jun 15, 2007]
    if you have replaced the sensor and its working ok then it sounds like the abs controller.
    Maybe try swapping the 2 front sensors around, long shot but may indicate something.
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  9. Quattro john
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    Quattro john New Member

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    [Jun 15, 2007]
    Thanks for the help Chris , i'll give it a go.
    Cheers John.
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  10. Emmo
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    Emmo Member

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    [Jun 16, 2007]
    I got it off ebay..


    as for swapping the two sensors around, I dont think you can as the left hand side is made for the left and wont fit on the right and vice versa.

    have you made sure the ring where the abs sensor senses from is not bent or dirty?
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  11. Quattro john
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    Quattro john New Member

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    [Jun 18, 2007]
    Thanks for that. I've tried another sensor but still comes on after a while. I will try and clean the ring on the cv joint and see if that helps. Any idea what the gap between the sensor and the ring is ?
    Cheers John.
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  12. terrysingh
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    terrysingh Member

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    [Jun 18, 2007]
    double check that the abs slots on the cv joint are clean, a missing reading caused by brake flakes or dust in the slots could cause this fault???
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  13. Quattro john
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    Quattro john New Member

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    [Jun 19, 2007]
    No problem i will clean the abs ring and see if that does it.

    Many thanks John.:arco:
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  14. Quattro john
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    Quattro john New Member

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    [Jun 28, 2007]
    Finally got around to working on the car.....i removed the abs sensor and found the hole was all rusty and there should be a tapered tin holder (for want of a better word) that holds the sensor in the hole with a good tight fit.This part was corroded away to next to nothing. I remembered thankfully that i asked to keep the old sensor that "AUDI" had removed and in the box was the new holder. I fitted the holder and replaced the sensor. I then cleared the faults with vagcom and gave it a try. No abs fault now,its just a pitty that audi don't fit all the parts that you pay for as that would have been the problem gone for good and saved me the time and messing about.So i guess the moral of the story is just because they charge the earth doesn't mean there any good!
    Many thanks to all the people who have given me help and advice to get to the bottom of this annoying problem.
    Cheers John.:arco:
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