Question about 2002 Audi A6
If ABS is activating for no apparent reason then the most common causes are failed ABS wheel sensors or more commonly, cracked reluctor rings.
You won't usually see the crack in a reluctor ring, but it opens up when it rotates at running speeds. You can also get it to show with a simple fluorescent dye crack testing kit (not cheap to buy for a one-off job, but any decent garage or engineering workshop will have a kit to hand).
Unfortunately, reluctor rings are expensive as they usually come as an integral part of the driveshaft or hub assembly. Third party versions may be available and are less expensive (still a painful price though) but to fit them they must be heated until cherry red and then dropped into position. Get it wrong and you have to cut off your new and expensive ring and start again. Not really a DIY job unless you're very confident and experienced.
If the crack test proves negative, then ABS sensors are easy to fit and can be tested by swapping around to see if you can move the fault from one wheel to another or even from the front to the rear. Sensors are relatively cheap, but failures are far less common than with reluctor rings.
Fingers crossed for you that it's the easy/cheap fix.
Posted on May 27, 2010
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Posted on Jan 02, 2017
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