I would BET (although I can't be certain) that the unit HAS a hidden mode switch for US and European AM frequencies spacing. Probably achieved by pressing a couple of buttons together and the same time. Anyone Ford engineers lurking around here to comment on this question?
Yes, something like that. I would highly doubt that the internals of the this unit are different from market to market, after all they built the Fiesta as a potential world car when they were designing it so for cost reasons and ease of production the chasis is most likely the same on US spec and ROW spec cars all that needs to be altered is the software. The software probably included mapping for US channels to begin with but it is "set" to Euro spacing.
It is possible that you need a Ford Scan tool to make the change, but for something like this I would think that Ford would make it adjustable by the customer as well. If you have access to someone with the scan tool ask them to check out the "convenience module settings" or "radio settings".
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