Things You'll Need
Instructions
Power on your PSP with the Need for Speed Carbon: Own the City game inserted and begin playing the game; after opening credits, the game will take you to its title screen, where cheats can be entered.
Unlock every earnable feature in the game, including cars, car parts, and regions, by pressing the following sequence of keys: X, X, Right, Left, Square, Up, Down. The direction keys (up, down, left, right) should be entered using the direction-pad (styled like those found on older consoles) and not the analog stick, which can move in every direction.
Give your driver unlimited "Speed Breaker," an advantageous boost which slows time around you, allowing you to make better decisions and control yourself more precisely by typing Down, Right, Right, Left, Right, Up, Down, Square. Speed Breaker is measured by an orange bar above your speedometer, and will not deplete after activating this cheat.
Enter Left, Up, Down, Left, Down, Right, Square into the title screen to activate unlimited NOS, or nitrous oxide, which gives your car an incredible burst of speed as long as it lasts. NOS is measured by a green bar underneath your speedometer.
Unlock a Transformers car (from the popular cartoon and movie franchise of the same name) by entering X, X, X, Square, Triangle, Triangle, Up, Down or unlock a jet car by typing Up, Down, Left, R1, L1, Circle, Triangle.