The anti-lock brake system (ABS) control module may fail causing the ABS light to illuminate. Failed modules should be replaced to restore ABS operation.Google+
Car Problem Reports
Audi A4 Quattro ABS Light Due to ABS Control Module Failure
Audi A4 Quattro Problem
Average Mileage: 113,000 mi (57,000 mi - 154,000 mi)
Visitor, 1999 Audi A4 Quattro, 135,000 mi
shop wanted over $1100 to fix. Left it as is.
Visitor, 2004 Audi A4 Quattro, 78,000 mi
same problem. sometimes it turns on. i just restart the car and it goes away. wierd tho
Visitor, 1999 Audi A4 Quattro, 154,000 mi
ABS Brake lIghyt and Airbag light are on. Heard it was best to get a machanic to plug a scanner in to see if they can communictae with the ABS contro module if no then it should be replaced to fix the issue. Don't go to the dealer thou it's far cheaper to get a rebuilt one and have a trusted mechanic install it.
ABS Light came on, I took the car to a local repair shop and they removed the Electronic Control Unit and sent it out to be rebuilt. The brakes still functioned, albeit without ABS, until the ECU was rebuilt and reinstalled. A $500 repair instead of $1500.
Visitor, 2000 Audi A4 Quattro, 140,000 mi
ABS control module failed. sent off for rebuild.