Prefab Losing Target Transform

I'm making a game where police cars chase the player. I have empty GameObjects around the world instantiating my police cars using a "Police Car" prefab when the player is near it. This same car prefab is also destroyed at a certain distance away. The problem is, my prefab does not keep the "Target Transform" in the "Car AI Control" or the "Car Controller" scripts. This means when the car instantiates, it doesn't follow the player. This seems to happen to all of the prefabs I create. I am using the Unity "AI Sky Car" with my own car body on it. If somebody could help it would be greatly appreciated.