Hi.....
The security/immobiliser chip is in the bsi unit which is clipped onto the rear of the fuse box behind the flapon the dash,......
Most people (inc fiat) say these cant be recoded, but i can assure you they can.....
Find an electronics specialist near you and ask arround, if not contact computec in livingston scotland and mark WILL be able to help you and his prices are very reasonable
Hope this helps