Hi Im new here and recently my B6 A4 has started to respond slow, in other words the turbo isn't kicking in until about 2100 revs and the car is dead until it reaches that. Has anybody any idea what it could be. Its a 1.9tdi by the way. Anyways back to the original question. The vag com cable will not pick up my car, the cable works as we tried it on another a4 and works perfect. Where would I look for a loose connection/ or is there a fuse for the port, if so where is it? Thanks.