Thanks wpoll.

The fuse was the main one for the DDE I thought. I would have to go back into it and see to be sure.

The boost solenoid was swapped out works exactly the same. We also locked the turbo closed, it could build boost all the way to 25psi, but only with revs and it made no extra power down low.

The car is a 2004 X5 e53 3.0d (218hp).