The European car mechanic has given up on trying to figure out why the emissions light stays on after checking it with computer and seeing no error codes. Changed spark plugs, wires, fuel filter...still the engine shakes (mis-firing?) and light remains on. I will have to take it to Audi and pay the big bucks. Anyone know what else to check on the car before I take it over? It is a Quattro 2.8L with 101,000 on it. Thanks. [img]/ubbthreads/images/graemlins/confused.gif[/img]