i haven't got any pictures of mine but the ones in this thread are good. If you look underneath your exhaust you'll see the flap on the left hand tailpipe. Pop the pin out and turn it out of the way with some pliers, you'll then be able to lift the flap freely with your fingers. Push it up as far as it'll go and tie it with some wire. Job done. If like me you don't notice any difference you can just untie it and pop the pin back in. Hope that helps.
Audi=No fault code, no idea