I just bought a 2002 TDI Jetta ALH with turbo issues for a good price. Before I bought the car I had a mechanic drive the car and he said the turbo was bad. It feels like the turbo is never engaged. I do not have a vag com, but the auto scanner returned a p1556 code which I believe translates into boost deviation pressure negative. I replaced all of the vacuum lines, the boost pressure sensor, the actuator, and cleaned the intake and egr valve. The piece on the turbo that the actuator rod attaches to seems to move freely. I am going to check the N75 valve later this week. I pulled the electrical connection off of the MAF sensor and there was no change in the way the car ran. I do not think this is the problem, but I dont know. Should I pull the turbo off and clean it or just buy a new turbo:ugh?
Thanks
Thanks