Unlimited Key Mode
WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
This system contains a feature named unlimited key mode (UNL_KEY_ID PID). This feature allows a customer to program more than 8 keys to their vehicle if they request it. Each vehicle in unlimited key mode is set up with a special unlimited transponder security key code. This allows all the customer vehicles to share the same keys, but no other keys from outside can be used to operate the vehicle(s). Any randomly selected security key is acceptable. Refer to Spare Key Programming - Unlimited Key Mode .