Cheat Codes (enter these during gameplay):
Note! If you save your game with some of the cheatcodes activated you cannot deactivate them again.

All Weapons - R2(x2), L1, R2, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, UP.
Full Armor - R2(x2), L1, L2, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, UP.
Full Health - R2(x2), L1, R1, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, UP.
More money - R2(x2), L1(x2), LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, UP.
Lower Wanted Level - R2(x2), L1, R2, UP, DOWN, UP, DOWN, UP, DOWN.
Higher Wanted Level - R2(x2), L1, R2, LEFT, RIGHT, LEFT, RIGHT, LEFT, RIGHT.
Clear Weather - L1, L2, R1, R2(x2), R1, L2, Triangle.
Fog Weather - L1, L2, R1, R2(x2), R1, L2, X.
Cloudy Weather - L1, L2, R1, R2(x2), R1, L2, Square.
Rainy Weather - L1, L2, R1, R2(x2), R1, L2, Circle.
Tank - Circle(x6), R1, L2, L1, Triangle, Circle, Triangle.
Faster Time - Circle(x3), Square(x5), L1, Triangle, Circle, Triangle.
Wear Any Outfit - RIGHT, DOWN, LEFT, UP, L1, L2, UP, LEFT, DOWN, RIGHT.
Lots of Money - R2(x2), L1(x2), LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, UP.
People Fight Each Other - DOWN, UP, LEFT, UP, X, R1, R2, L2, L1.
People All Hate You - DOWN, UP, LEFT, UP, X, R1, R2, L1, L2.
Crazy Pedestrians - R2, R1, Triangle, X, L2, L1, UP, DOWN.
Pedestrians Box Each Other - RIGHT, R2, Circle, R1, L2, DOWN, L1, R1.
Great Handling Cars - R1, L1, R2, L1, LEFT, R1(x2), Triangle.
Blow Up All Cars - L2, R2, L1, R1, L2, R2, Triangle, Square, Circle, Triangle, L2, L1.
Get the Dodo Car - RIGHT, R2, Circle, R1, L2, DOWN, L1, R1.
Get Some Air - X, Square and Down on the left analog stick.
Warp to Shoreside Vale - L1(x2), R2, Circle, Triangle, L2, R1, and X.
Gore Mode - Square, L1, Circle, DOWN, L1, R1, Triangle, RIGHT, L1, X. (This does not say Cheat Activated but it does work)