headlamp range control?

Hi,hope someone could help me on this one,recently bought myself a 2006 a3 that needed repairing and had to replace many parts most of which i got 2nd hand,after finally finding the right headlights it is supposed to have (bi-xenons),now they are fitted,i get a message saying 'range control defective'. lights work ok and car has passed mot,but i think maybe they need to be reset or something,have checked all the obvious things,any one any ideas appriciated.Tim

Thanks for reply,Im in Doncaster,will look for a decent place and get it scanned.