Hi all. I just bought my first Audi, a 1999 A4 wagon. After driving in snow the first time, I discovered the ABS didn't work. There is no ABS light flashing on the dash. I took it to a shop, and they said someone had disabled the ABS and managed to not have the computer throw a code...very clever. Any ideas on how this could have been done and maybe re-enable the ABS?

Thanks