On 2 player go outside the cantina. Then build or find a car. Then let player 1 get in the car. Player 2 should press triangle near the car whilst player 1 is in the car. Soon player 2 will vanish. When that happens player 1 should get out the car. Then player 2 can drive around in a car with no driver. P.S if you want 2 undo the cheat press triangle near a playable character.