I have this issue which comes up between 3500-4000 rpm in 4th gear or higher and the car goes into limp mode and brings up the error code 02345a. Originally i also had turbo lag which was decide to replace the turbo. Lag now gone, but limp mode at high rpm prevailed. I then cleaned the map sensor (was caked in crap) and no joy, but the limp mode now shows more power than before?? Very confused and don't know what i should do next, any help appreciated!!