The only code you'll find inside the key is the serial number on the PCB, that's what is entered into the car's systems by T4 to operate the central locking.
When Russ did me spare key for the 260 he had to remove the EWS unit from under the dash, connect it to his equipment to read it then place the new transponder into the equipment and program it.
I dare say one of the "key guys" will be along at some time with some advice.
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