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  1. #1
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    Member No: 11994 abdoul is an unknown quantity at this point abdoul's Avatar
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    Help! ABS/ASC/Traction Control Mysterious problem

    I have a 1999 740i with teh following diagnosed problems:

    -- three ABS sensors were bad

    I replaced all four sensors but am still having these problems:

    -- ABS/BRAKE and AST symbol are lit permanently
    -- Speedometer no longer works

    EXCEPT

    (1) when it's really cold in the morning (2) for about 10 miles or so then it dies.
    -- occasional loss of power steering..

    I had the system reset by my mechanic many many times.. but to no avail. I have 4 new abs sensors installed (properly.. cleaning before installing and what not...)

    Where do I go from here

  2. #2
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    Re: Help! ABS/ASC/Traction Control Mysterious problem

    The speedometer issue would seem to point to a bad sensor, but it is extremely unlikely that multiple sensors (especially 3 or 4) are bad. In my case, the computer said a sensor was bad, but actually the control unit itself was defective. There is a repair kit available (about $800) if this is the case for you.

  3. #3
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    Member No: 11994 abdoul is an unknown quantity at this point abdoul's Avatar
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    Thanks.. guys.. I was in .... denial! :(. $800?!


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    why would it work when temp < 35 degrees

    That's mysterious! Whenever it's freezing outside... both speedometer and traction control works... ?!?!?

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    Re: why would it work when temp < 35 degrees

    I wish I had a good answer for that but I do not all I know is that was the problem with the car I had here and yes I pulled my hair out before I figured it out.

  6. #6
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    Re: why would it work when temp < 35 degrees

    Looks like I am buying a DSC/ASC controller.... Cheers

  7. #7
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    I PAID $ 75.00 FOR REPAIR KIT ON EBAY


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    Re: Help! ABS/ASC/Traction Control Mysterious problem

    It is in fact the ABS/ASC/DSC control computer which is on the front of the ABS pump. Delt first hand with that and that is exactlly what it did.

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    Re: Help! ABS/ASC/Traction Control Mysterious problem

    It works when it's cold most likely because of a "cold solder joint" in control unit. Before I shelled out any money I would open up unit and investigate. Your looking for small rings/cracks in solder around the heavier components. Output transistors,relays etc..

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