If you are prompted for a PIN while pairing your (not the software), the most common default codes are: 1234 (Most common for ELM327) 0000

If you have lost your key, you should contact WGSoft.de Support with your purchase details to request a recovery.

: Licenses can be bought directly from WGSoft.de or OBD-2.de .

You're looking for information on ScanMaster ELM327 and its registration key. Here's what I could gather: