[ConorE39]

I have an E39 530D and am havin problems with the car loosin boost and goin into a sort of "limpmode"car drive fine until 60-90mph looses boost and stay dead then..sometimes after a drive power will come back but to be soon lost again..i have already replaced the boost pressure sensor and air flow meter????all the vacum pipes i have checked and seem ok any ideas????thanks guys