hi i have a zafira 2.0 diesel 2003 which keeps going into limp mode, the code p0105 boost pressure signallow. i have checked the pipes for air leak all seem ok i have changed the map sensor and still the fault appears, at the map sensor there is 5v and the signal wire is showing around 1.5v but as soon as the spanner light comes on the signal wire drops to 0v at the map sensor before it gets to the ecu.has anybody any clues or suggestions any help would be appreciated.
