Question about 2001 Audi A4

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Audi ABS breaking system error - 2001 Audi A4

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If the ABS fault light comes on as you turn on the ignition and control unit can't be accessed with a fault reader then the control unit itself is faulty and must be repaired or replaced. if can be accessed, should store a fault in the memory, most probably in a wire to wheel speed sender. if light comes on only after vehicle is in motion than fault will be a dirty or incorrectly adjusted speed sender.

Posted on May 15, 2010

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Hi My abs light comes on and the break light flashes on the dash board also the gear light is not showing and the automatic will not change up but after about 25 miles the auto box starts to work as normal can anyone help me with this problem I think it could be a broken wire or lack of oil in the gear box if it is hoe do I check the oil and how do I fill it up my thanks too anyone that can help it's a audi A4 se 2001

Posted on Mar 26, 2011


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2001 Audi A6 error codes 1127, 1129, 1136, 1138

Those codes would appear to be in conflict with each other - system too rich and system too lean.

The hard shifting is the kicker though - that points me straight at the MAF sensor. My bad MAF on my S8 gave me that exact symptom, with a very hard shift 1-2 under full throttle.
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Yes there is a abs sensor on each wheel. You should be able to see the wire's going to it.The sensor itself it easily damaged and will most likely break if you try to remove it so if one faulty you may end up changing both if you change the faulty one first you will only need one but it change the good one as it will probably break removing then you will need both their is no way to check for the faulty one other than try a new one. They can check in the audi workshop but would cost a bit

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1 Answer

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Your car, like mine, has suffered the usual ABS pump electronics failure.

I have an almost identical car.

There are some great threads on the net on repairing them, however the wires inside it are just shockingly small, hair sized, and not a job for even the best "DIY" solderer.

Replace the electronics module on the side of the ABS pump, it doesn't need the brake pipes loosening or anything. It is easy to swap.

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You will NEED to find a used unit, or have yours repaired though, new ones are rediculously expensive.

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