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Had the AA out today who says that the immobiliser is no longer recognising the key.
Tried several tests and says needs to have the immobilser/key re programmed.

Which is what was mentioned on the page i pointed you to, it said --
Immobilizer warning light on Ford B-max: Neiman or key issue:

We will have to start by checking, if the key is still operational. Indeed, in the event that it has undergone an impact, it is likely that the latter is deformed. Therefore, we can assume that it no longer manages to communicate with the vehicle thanks to the transponder for authentication. Or even just that she's discharged.
So do the verification using the second key of your vehicle, in case it works, then you may have identified the source of your dysfunction. If you don't have the second key, try replace yourself the battery.
 
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