Disabling Unlimited Key Mode

WARNING: This page is about a different car, the 2005 Mercury Sable and 2005 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: By disabling the unlimited key mode with a random 8-digit number the previous access code will no longer operate the vehicle.

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: PROGRAM UNLIMITED TRANSPONDER SECURITY KEY.
Enter an 8 digit random number (not 00000000 or 00000001).
Select: IGNITION KEY CODE ERASE.
Disconnect the diagnostic tool and turn the ignition key to OFF.
Program two keys to enable vehicle.
Program any additional keys using either KEY PROGRAMMING USING TWO PROGRAMMED KEYS or KEY PROGRAMMING USING DIAGNOSTIC EQUIPMENT .