As a tourist driving through town with an in-warranty car that threw a check engine light, I stopped by at 8am to have the fault code read. "Do you have an appointment?" "no." "then we won't be able to help you today".
I have seen a lot of bullshit as an Audi owner before, but this takes the cake. I didn't ask them to rebuild my engine on the spot; just to read an error code. My local dealership at home confirmed that they do this daily without any fuss for out of town travelers who need help.