Thanks Kev, just tried that and for some reason I can't fathom, it ain't working.
Maybe I'm a dumbass but its a '97 A4 tdi quattro. I did what you said about pulling button 2 but it didn't seem to move and from then on nothing made a difference. "In 2" still flashes.
Maybe I should set fire to the car, that would get rid of the service light! :-(