When you go to the seceret underground base in havanna you go to the bottem of the bace and to get the minni car you go to the wall and you will see a gray box on the wall with a red little sqare in it.
Use the action butten (triangle) and the platform will come down and then you can get in the minni car.
More tricks, tips and cheats for this game are right here - Driver 2 cheats
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