Just in case it is the transponder ring, did I read correctly that you have the capabilities to marry keys with a new transponder ring? Just in case that's the solution!!!!!!!!
Where is the chip, is it at the end of the key plastic body with a plastic oval cover over, next to the metal part of the key?
The transponder ring is generic so not matched to the key or chip, the chips are paired to the immobiliser embedded within the ecu. I have successfully married new key chips to ecu's,
here.
The Duratec or Ford transponder ring is normally very reliable. As Dave mentioned, the first thing to check would be the connector on the ring.
![[Linked Image]](https://tm-img.com/images/2024/09/19/key-chip.jpg)
