FORD 2010 Crown Victoria v.2 - Manual (Page 90)

5. Within twenty seconds of removing the second coded key, insert the
new unprogrammed key (new key) into the ignition and turn the ignition
from 1 (off) to the 3 (on) position (maintain ignition in 3 (on) for at
least one second). This step will program your new key.
6. To program additional new unprogrammed key(s), wait at least
20 seconds and repeat this procedure from Step 1.
If successful, the new coded key(s) will start the vehicle’s engine and the
theft indicator will illuminate for three seconds and then go out.
If not successful, the new coded key(s) will not start the vehicle’s engine
and the theft indicator will flash on and off. You may repeat Steps 1
through 6. If failure repeats, bring your vehicle to your authorized dealer
to have the new spare key(s) programmed.
Locks and Security
90
2010 Crown Victoria (cro)
Owners Guide, 2nd Printing
USA (fus)