hi, i have a very simular problem on my 04 reg a3 tdi sport dsg - the eng mgmt light has been on,i have been told its due to the "inlet manifold flap motor"? as the engine runs fine and drives well i have put off the repair... HOWEVER,i have recently discovered (only in very heavy traffic - 1hr+) that the engine will start to overheat eventually as the Fans do not cut in!! after investigating i have found that FUSE F8 (10A) was and keeps blowing... do your cooling fans cut in ok if its left running stationary ???
im still not sure wot the problem is (awaiting answers from so called Audi experts) but will let u know if /when i suss it out...
please let me know if u Have/do sort your problem out.