How to Program a 2004 Mitsubishi Montero Ignition Chip Key Transponder

Step by Step How to Programming Instructions:

Note: You need two valid keys to add a new key to the system. If you don’t have two working keys, you’ll need a locksmith to program one for you.
1. Insert the first valid key into the ignition switch. Turn the ignition switch to the ON/RUN position for at least three seconds, but no longer than 15 seconds. Then, turn the ignition switch to the LOCK position and remove the first key.
2. Insert the second valid key into the ignition switch. Turn the ignition switch to the ON/RUN position within 15 seconds. After 10 seconds, a chime will sound, and the Vehicle Security Light will begin to flash. Turn the ignition switch to the LOCK position and remove the second key.
3. Insert the new key into the ignition switch. Turn the ignition switch to the ON/RUN position within 60 seconds. After 10 seconds, a single chime will sound, and the Vehicle Security Light will stop flashing. To indicate that programming is complete, the Vehicle Security Light will turn on again for seconds and then turn off. The new key is now programmed. Repeat this procedure to program up to eight keys.