I have a quick question:
All of the walkthroughs I have read for the game state that you can't drive right up to Cosmo Canyon with the buggy because it'll break down. Mine has never broken down, and I don't understand why. I'm glad it hasn't, but it's always confused me. I'm playing the version that came from the PlayStation Store, but I don't see how that'd make a difference because it's a simple port, isn't it?
I only started playing this game last year, I haven't beaten it yet, in fact I restarted it because I didn't play it for a while, and I'd forgotten what had happened.
Did you already do the Cosmo Canyon part? where you enter it and go through Red XIII's little story and fight the GI Boss?
If you did and you got out before you got to Cosmo Canyon it wont break down, but if you try to drive pass it before you do it, then it will break down.