Radio code i changed the batterry of my 01, mitsubishi montero sport and after i turned on my car a code came on the screen idont know the code

I changed the batterry of my 01, mitsubishi montero sport and after i turned on my car a code came
on the screen idont know the code

You should be able to contact the dealer and provide proof of ownership, and they may be able to give you the code. You may have to remove the radio and give them a service number located on a sticker. or they may have to reprogram it with a code of your choice.