[quote name='Stoney871' timestamp='1330473239' post='169510']
If a key has been cloned then the PATS security system will only recognise it as the first one being tried twice.
To check if the transponder is present in your new key, and here I'm assuming it's a 3 button key with a horseshoe type blade fitting, pop the horseshoe off and you will see a square bit sticking out of the end of the fob.
The transponder is a small glass tube that will be sticking out slightly from the square.
If there is no transponder then Ford do them but charge a lot.
I always recommend auto locksmiths as they can supply and code keys / transponders and will charge a lot less.
The rapid flashing light is the PATS rejecting the key.
The key is the standard no button key. I have got the red top out of the key (thanks Ford not easy and will always have a removal mark now) and the transponder is there!
I will now check with the company who 'created' the new second key to see if they cloned or programmed it - looks like a cloned key so far