All vehicles
Pause the game and highlight the "Map" option. Then, press Up, Down, Up, Down, Y, A, Y, A, X, B(2), X. If you entered the code correctly, you will hear the sound of an engine.

Restore health
Pause the game and highlight the "Map" option. Then, press X, B, X, B, X, B, X, B. If you entered the code correctly, you will hear the sound of an engine.

Infinite ammunition
Pause the game and highlight the "Map" option. Then, press Y, X(2), B, Y, X(2), B. If you entered the code correctly, you will hear the sound of an engine.

Weapon power-ups respawn immediately
Pause the game and highlight the "Map" option. Then, press Y, A(2), Y, X, B(2), X, A, X, B, Y. If you entered the code correctly, you will hear the sound of an engine. You still need to find where the original weapon power-up appears, then collect it again. It will also cause some weapons which you have not unlocked to appear next to your garage. However, not all weapon power-ups are next to your garage. They are usually nearby, but on a ledge or around the block.

Extra money
Pause the game and highlight the "Map" option. Then, press Y, B, Y, B, X, A, X, A, Down, Up. If you entered the code correctly, you will hear the sound of an engine.

Decrease RIOT level
Pause the game and highlight the "Map" option. Then, press Y, B, A, X, Y, B, A, X, Down. If you entered the code correctly, you will hear the sound of an engine.

Increase RIOT level
Pause the game and highlight the "Map" option. Then, press Y, B, A, X, Y, B, A, X, Up. If you entered the code correctly, you will hear the sound of an engine.

Tornado
Pause the game and highlight the "Map" option. Then, press Y, B, A, X(2), A, B, Y. If you entered the code correctly, you will hear the sound of an engine.