I just got a Vento 98 with the 90hp AHU engine and this thing is driving me nuts. It has a mind of its own. It will not let me go over 3k rpm without shutting the turbo down. I can see that this is a very common problem. I have run VWs for 30 yrs but never had a motor that slaps my wrists like this one does.

I fix my own cars to high standards..far better than any pro does but this thing is a pain in the A. Not only does the body rust far too easily the thing has 7 sensors that means there are 7x6x5x4x3x2 ..about 7k ways to fail..