My daughter has a fabia mk2 and have had the issue of the flashing light ... when code reader has been on it says over boost and underboost?
/ turbo vanes wrong position....We tried new actuator and new n75 pressure valve and still the same thing was happpening.
in the end a local mechanic has fitted a new turbo and of filter too. The car was brought back on the notion of being fixed , but when my daughter went to take it home the flashing light returned and it dropped into limp mode ( paid 1,000 pounds for the job ).the car has now been parked up as the mechanic says he’s done all he can do with it!!
Does anyone have any ideas as to what the issue can be as obviously its not the turbo, i’ve Even had a check of the valve pipes from the pressure valve and they seem ok.