Key programming on a used ECU

rynzms3

Member
:
08.5 MS3, 93 FD, 10 6 GT
I am curious if the dealer can and/or will cut and program new keys for a used ECU? Will the car recognize my old keys with a different ECU? I know the signal goes through the ECU before going onto the key control unit. Once my used ECU shows up, what should I expect to do?
 
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