Mk5 golf 05 plate GT TDI

[Jenkins2909]

Having a problem with my mk5 5 gt tdi golf. Keeps coming up with emissions problem and putting it limp mode at around 70 mph. I've had it cleared and also blanked the egr of but still come back on. Thinking about having it maped and blanking the egr of all together. Will this make a difference does any one know. New problem has recently come up with the turbo over boosting when had the machine on it it's saying it's the turbo boost sensor any ideas ?