Joined the club and bought a 17 plate Monte Carlo with two keys. The one I’ve been using since purchase has been working as usual, but the second key doesn’t respond regarding the central locking. Works fine to lock and unlock the traditional way, and in ignition, have replaced the battery in the fob and tried several YouTube videos suggested to resync the fob but nothing working as yet. Any guidance? Don’t really want to have to fork out at a dealership for them to give it a try, but might have to resort to it if that’s the only answer.