So if I get a second hand remote one could they clone my key to that ?
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They could clone your existing immobiliser chip onto a new chip and insert it into the 2nd hand key.
You've got three parts to the key:
The blade (needs cutting to your car so that it can turn in the locks and the ignition)
The Chip (a glass tube in the remote which can be removed and swapped)
The remote - these can easily be programmed to operate the locks without the need for multiple keys etc
If you had 2 unique working keys then you could programme a 3rd key in yourself - you could just buy a second hand one and use the chip inside the 2nd hand key - you'd just need a new blade.
As you don't you have two options:
Option 1. Buy a 2nd hand key, then get a blade cut (cheap on ebay) - take this key to a garage with proper ford diagnostics - they will then charge you about £50 to programme it to your car.
Option 2. Buy a 2nd hand key and a blank blade and take it to a decent key cutters who will clone your existing chip onto a new chip and cut your blade to match. Last time I asked for a price for this it was £30 at our local key cutters.
Option 1 is techincally better as you can then add further keys but it's whether your really need to or not?