I recently got the CEL for P0234 turbo overboost and have been driving with it for a couple weeks now. The car is a 2001 jetta tdi with 240xxx. Im suspecting its a vacuum leak ( hopefully ) and I've already checked the intake/snow screen and everything's fine, the air filter was changed about a month ago. Now I don't have a vacuum gauge really to check the lines but the cloth on some of the lines have been chaffed passed the cloth lining, could that be the cause and I should just go ahead and change them?