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ABS Warning light (ECU)

Discussion in 'A4/S4 forum(B5 Chassis)' started by diarmuid, Oct 27, 2004.

  1. diarmuid

    diarmuid Member

    Sep 28, 2004
    Likes Received:
    Was meaning to post this at some stage but didn't get around to it until now....

    A few months ago the yellow warning abs light came on on my '98 A4. I took the car to an audi dealership and they told me that I had a faulty ECU (apparently quite a common fault). I was quoted £850 excl. VAT and labour for a new ABS pump and ECU (audi only sell the whole unit). /ubbthreads/images/graemlins/cry.gif /ubbthreads/images/graemlins/cry.gif As you can imagine this was a bit of a shock. /ubbthreads/images/graemlins/blush.gif

    I decided to take my car to an Audi specialist (non dealer) to see if they could do any better. They first thought that it was a wheel sensor but after running the diagnostic they said it was indeed a faulty ECU. As they were BOSCH dealers they said that they could get their hands on a new ECU for £450 excl. VAT plus £150 for labour. Still a bit steep for me /ubbthreads/images/graemlins/cry.gif The guy also told me that my car would not pass its MOT unless it was fixed (not good)

    I did a search on the net for other people who have had this problem and found that changing the ECU is not that big a deal. In actual fact the ECU just slides out from the pump. So I managed to buy a second hand ECU for £150 with a one month warranty. Taking off the old ECU was a bit rtricky without taking out the windscreen washer fluid holder (it can be done with a bit of dexterity) In all it took about an hour to take off the old ECU and put on the new one. I was very relieved to when the ABS warning light went off when I turned on the key. The car has since passed it's MOT and yes the ABS does work! /ubbthreads/images/graemlins/laugh.gif

    Sorry for the long post but it might come in handy for someone else with the same problem.

    All The Best,
    Diarmuid /ubbthreads/images/graemlins/beerchug.gif

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