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Gem Module Fiesta Mk6 Facelift

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Can someone please confirm if the GEM module on a Ford Fiesta mk6 facelift (2006) controls the PATS?

Under diagnosis (link below) on the facelift gems it mentions PATS, could someone tell me whether it is responsible for the coding of the keys?


So someone changing from the A module to a better one (B or above) would he have to recode the keys?

My friend is trying to upgrade his fiesta to an ST-like one but has an A gem and wants to upgrade to a C gem to add original alarm (he does not want 3rd party stuff just original ford stuff) would he have to go to the dealer to recode his keys?


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