"engine overboost"-2000 XC

[Schandmaul]

What could be the possible cause of the above mentioned code? Sorry I can't remember the number of the fault, but that is what it translates to.
The car had a new turbo put on it when I bought it and, interestingly, the rear end is from a V70 R. Go figure.
Has this thing been modified or what? When I really get on it, or use the cruise control to accelerate (i.e. resume), I get the Check engine light and this code pops up.
Please help.
Ryan M.

[knucklebuster]

The turbo was not installed properly. Exhaust gasses should start bypassing the turbo once the boost has reached the limit. There is a hose from the manifold to a diaphram on the turbo and a rod connecting that to the waste gate. There may be a problem with the hose, or the rod length needs to be adjusted. I'm not an expert on that but it should be a simple fix for a good mechanic.