The PCB and transponder are totally separate things and in no way connected. The PCB operates the central locking, the transponder speaks to the immobiliser. Can't reuse a transponder, needs to be a virgin one paired with the cars security system (EWS) using specialised equipment, not a T4, completely separate bit of kit which some of the traders have is required Be careful using alleged key specialists, many of them simply copy the code from the EWS and it will only work for so long, the transponder/EWS work on a rolling code, constantly changing.
Nearest trader who deals with keys is Chris in Portsmouth.
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