Hi, Had an error code of intermittent N75 valve for some time, checked all wiring and finally got round to replacing the N75 valve itself. (Interestingly the old and original valve was a C, new one is an F). However, I now get the error code - 17956/P1548/005448 - Boost Pressure Controle Valve (N75): Open Circuit Checked the wiring as best I could and it seems to be fine. Get the same error with it connected or not. Is the new N75 likely to be faulty? Is there a way to check it? Any tips on checking the wiring ? Many thanks !