I have an Audi A3 2.0 TDI with an overboost.... " P0234 " condition. At first i thought it was a turbo problem i.e " sticky vains " due to a build up of carbon. so i ran innotec turbo cleaner through it to see if it would solve the overboost problem. So after that didn't work i checked the throttle body " intake manifold flap motor " and it was solid with gunk and would not budge !! so i took it off and cleaned it + egr valve with carb cleaner and still no joy :annoyed. Now the code for the manifold flap wont reset at all !! so i replaced the throttle body with a new pierburg one, and recalibrated it with the vag but still it wont reset !!! and still overboost !!! i'm going to see a vw master tech on thursday as i think it might be electrical. any thoughts on this would be a great help !!