Golf MK6 Turbo underboost P0299. Jump to Latest Follow. Hi I have a ford galaxy 2.0 tdci 2007, I have recently put a new turbo as the old one gave up Reason for asking is I'm now getting an P0299 underboost code and max boost is right at 20psi when before I was seeing 26psi off my vnt 17/22.
I've just acquired a 2011 A4 that I can't get through emissions testing because of an underboost error code. Odd part is for the past week or so, the P0299 is gone and now I have a leak in intake code, forget the number.