I’ve had a few problems with the turbo boosting. It’s had a new turbo installed 18 months ago and has been fine. I stopped driving it for a while and when I started to drive it again I noticed when I’m in the higher gears doing 80kmh-100kmh the turbo wouldn’t boost. I had a new battery installed and this issue went away and the turbo was working fine. It’s now recently gone back to not boosting when I’m in 4th or 5th gear. Seems like maybe something electrical. Maps sensor maybe? Just not sure why the change of battery would if fixed the issue in the first place.
cheers,