While playing the game, press Black(2), L, R, Left, Down, Right, Up, Left, Down, 
Right, Up. If you entered the code correctly, a message will appear. If your 
vehicle is on fire, enable the "Full health" code to extinguish it. This code 
also repairs your car. You cannot see the repairs, but it will act like a new 
car. If on a mission where you need to have a mint condition car, sometimes 
enabling the "Full health" code will fulfill the mint condition requirements.