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It's indicating that there is a fault in the system somewhere,which will usually turn out to be a faulty wheel speed sensor.
To avoid guess work,I'd get a local independant garage with the right equipment to read the fault codes as this will point you the right direction.
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo