an audi 100 2.5tdi loses boost pressure momentarily at full boost, there is a fault code "manifold pressure too high". The MAP sensor is new. I have measured the wastegate control valve to be performing normally, I have not been able to accurately measure boost pressure, as I believe it should be 1.8- 1.9 bar ,but my gauge only goes to 1.5 bar.
Is there anyone that has had this problem, or knows the answer? Help!
Jarvis