O.K. My 2000 Audi A6 T engine light turned on and I took it in. I was told that a hose had come disconnected. They reattched the hose and cleared the codes. Not a day later the Engine light came back on and I took it back in. They have had it now a week and can't find why the engine check light is on. The Air pump code comes up, but they are saying that the air pump is working... Does any one have any advise??????? I need my Car back!!!!!!!!!

 

Could be bad combi valves. Bad diverter valves. Bad vacuum sorce or vacuum leak. Bad combi valve control solenoid. Bad pump. Just because the pump runs doesnt mean its moving air.