Just replaced old batterie need 4-digit immobilizer overridecode 2001 mitsubishi montero sport

Dealership only mate, that is not a code that can be generated, I always take the 1-2 "thumb up" rating for taking this question, but I always answer it. Sorry, they are the only ones that have it if the original seller did not write it down on the owners manual for the original buyer. Good luck mate. Cheers