Disabling Unlimited Key Mode

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

Using a diagnostic tool, select PCM from the menu. Follow SECURITY ACCESS to obtain security access. For additional information, refer to ANTI-THEFT SECURITY ACCESS .
Select: DISABLE UNLIMITED KEY MODE.
Select: IGNITION KEY CODE ERASE.
Disconnect the diagnostic tool and turn the ignition key to OFF.
Program-in 2 keys to enable the vehicle.
Program any additional keys using either KEY PROGRAMMING USING TWO PROGRAMMED KEYS or KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT .