Hi I need some help.

I have just purchased a S4 and notice that the computer is flashing problem with the ABS and Airbag. I have booked it into the Audi Garage to get a diagnostics to see what is actually the problem.

I have just had Audi on the phone saying they can not get any reading from my car at all. For none of the controls units??? They do not have the time to investigate further and I have to wait until Thursday for any more work to be done. This sounds expensive to me and the car is not under warranty as it is over 3 yrs old. Is this a problem anyone has come across before? Grateful for any help here!!