Originally Posted by MarcSilverTriple
The pin code is supposed to be on a card that is delivered with the keys of the bike. The pin code is required each time you need to set a new key if I understood well. And the ECU request the code when it doesn't sense the immobilizer RFID which is in the key. I've seen the pin request a few time, and generally, the single fact of turning the key off and back on was enough to get the message disappeared.
Thanks ...Did concern me at the time and I have found the card with the code ..Good old italian querks I suppose
.. I do have and old Vespa and a lambretta so I am used to Italian unpredictability