I have one of the common problems that seem to curse these cars Charge pressure control positive deviation P1557 it comes and goes, as an experiment and I know it’s not a good idea but I have tried a few times when it starts to play up usually when you get to between 60 and 70 mph stopping the engine let it free wheel and restart it again and every time it picks straight up with no more problem. I have read on here about the sticky vanes etc but to my thinking it has to be some sort of electrical fault surely, the car has done about 130000 miles and has no other issues, any ideas would be appreciated, thanks.

David

Edited 1 November, 200916 yr by KOS
mileage

sticky turbo! - Get it stripped down and cleaned.

fault code also suggests N75 valve

Almost definately the turbo, sorry :(