So my wife told me the other day that the engine light had popped up so I told her to go get it checked. Two out of the three shops say that it has something to do with my fuel cap or a line is leaking. But she is now going to this shop to get our a/c fixed and he is telling her that one of my coils is messing up. He reset the ecu and told her to bring it back when the light pops back up so he can find out which one it is. I told her when she goes back up there to find out what are all the codes it flashing so I can look them up myself. I just wanted to ask if any one has ran into this problem on 04 S4. Also the first two places was good friend of our that work at a shop and just read the codes for us but don't really know how to work on Audis