I am sorry if this is already in here a bunch of times but here goes. My car started to feel doggy thursday like almost no acceleration and no warning lights in the dash. I drove it later and seemed to be better. Then saturday the check engine light came on, I can feel it accelerate but it doesn't seem as strong. I borrowed a code reader from an auto parts store and the code was P0234, that comes up as a overboost. I then barrowed a vag-com cable from a friend last night and have it plugged in now. It shows the same fault code but above that has 000564-boost pressure regulation. Is this a common code for the diverter valve going bad? I have been running APR stage 1 and a carbino intake for about 2 years. My car has a little over 90,000 miles on it. Glad to hear any help.