If the light stays on, the ABS is not ready for use. An Audi or Bosch workshop should determine the cause. As an amateur, you can in any case check the plug connections of the control unit, the speed sensors or the hydraulic module. In addition, it can be recommended to disconnect the speed sensors and clean their front side.
Tip: Even if the ABS warning light is on constantly, ie. ABS is not working, you must drive the vehicle with the electronic brake force distribution system inoperative. The rear wheel brakes can lock up relatively early. Particular care is required in corners, where an Audi with the rear brakes locked can skid the rear end. Driving carefully, find the Audi workshop.
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