ABS?
Depending on what kind of scanner the guy has, he won't be able to read the ABS computer anyway. I believe only a VAG 1552 etc, or VAG COM can access that control module. And, if the ABS controller is truly bunk, no scanner will be able to communicate with it, or the engine module, till you unplug the ABS controller. Just so you know.
However, if, as in your case, the light comes on immediately after you start the car, it is more than likely the ABS module itself that's faulty.








