Programming The Car Key: General
WARNING: This page is about a different car, the 2002 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
Four different car keys can be programmed for the same car. This means that the immobilization data can consist of 4 different identification codes from key transponders and 4 from the remote controls.
When programming a new car key with the diagnostic tool, all previously programmed keys are deleted. This prevents any unauthorized (stolen) keys being used.