knowing combi's , from my past experience it may have a position sensor malfunction? Most of the units i've worked on when the steering has a centering issue it has to do with the sensors not picking up or may be out of adjustment or something to that effect.
But like richard said, you should call combi and don't assume anything.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.