Hi I would be very greatfull for some help please .I've read loads of threads and followed lots of different suggestions but to no avail, problem is code 12 boost pressure and limp home mode. I Changed the boost pressure sensor also map sensor then discovered the brown solenoid was letting through so changed both of them, removed and cleaned all metal vac pipes replaced all rubber vac pipes checked they are all in the right place 100 times checked vacuum at every possible point all is good. What I gave discovered is that if I put 12v straight to the brown solenoid it all works fine solenoid, actuators all work in unison but just with it plugged in to its brown plug there is no vacuum coming from the other side of the solenoid to the turbo actuator. I've tested the brown plug and there is power there I am now at a complete loss as to where to go from here