Here is the instruction on programming remote key for Maserati via OBD2 by using SuperOBD SKP900 key programmer.
Instruction:
Connect SKP-900 with vehicle’s diagnostic socket via main cable
Select vehicle brand: Maserati
Select Key
Select Immobilizer system
Choose OBDII adapter. Turn ignition ON
Communicating
Select Key Match
All keys need to match otherwise will not be matched. New key should be pre-written.
Insert new key. Turn ignition ON.
Communicating
SKP900 will require to enter security code to access.
Manually enter the 5-digit pincode that you have pulled from Maserati dealer
Confirm pincode
Key Match complete
Go back to Maserati menu
Select Remote
Require to consume token when program remote for Maserati. Press Yes to continue.
Select Immobilizer system
Select Remote Match
Enter 5 digits security code again
Press Yes
Press Remote for 3s
Remote NUM: 1
Program next remote press Yes, otherwise press NO to go back
Test the new remote