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My car has been losing boost over last couple of days, I have checked all the piping and there is no leaks. I have KO4 setup (Audi A4 2002 1.8T) and my tuner did do a remap yesterday, as I thought it might be software, the previous map had requested boost of 1950mb but I only get 1800mb using vagcom (only happened over the last 3 days, setup was installed over a month ago) now the new map is a ko4 map with requested boost of 2400mb(1.4bar) but the actual boost I am still getting is 1800mb(0.8bar).I now think it might be a fault N75 valve as when you boost you hear the turbo sounding strange like the actuator is open, checked the DV and it is also fine. Will a faulty N249 all cause loss of boost. I am tearing my hair out not knowing what else it could be, pls help.
 
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