Ford Focus 2004 Owner's Manual page 72

Controls and features
ENGINE IMMOBILISATION
SYSTEM
The engine immobilisation system
is a theft protection feature which
prevents the engine from being
started with an incorrectly coded
key.
Keys
Your vehicle is supplied with coded
keys marked with a coloured dot.
Replacement keys must be recoded
together with your other keys.
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Automatic arming
The system is armed five seconds
after switching off the ignition. The
indicator light will flash every
two seconds.
Automatic disarming
Switching on the ignition disarms
the system if the correct code is
recognised. The indicator light
illuminates for approximately
three seconds and then
extinguishes.
If the indicator light illuminates
constantly for one minute or flashes
for approximately one minute and
then repeatedly at irregular
intervals, the system did not
recognise the key code. Remove
the key and try again.
If a key with an incorrect code was
used, a waiting period of about
20 seconds is required before
starting the vehicle with a correctly
coded key.