A: That is an error. CAR300 is always 4 digits. You have the wrong generator (e.g., for a CDR500 which uses 5 digits).
Legal / Compliance
For professional locksmiths or advanced users on MHH AUTO, the "Dump" method is considered the most reliable because it reads the actual code stored in the memory chip, bypassing the algorithm entirely. Opel Blaupunkt CAR300 code generator - MHH AUTO - Page 1