From IGN.com :
Cheat: Unlock Rhino Tank
The creme de la creme... the Rhino! To unlock it, enter this code during gameplay: CIRCLE, CIRCLE, L1, CIRCLE, CIRCLE, CIRCLE, L1, L2, R1, TRIANGLE, CIRCLE, TRIANGLE.
Submitted by IGN Guides
Cheat: Media Level
Press R2, CIRCLE, UP, L1, RIGHT, R1, RIGHT, UP, SQUARE, TRIANGLE during play to display your media level.
Submitted by Alex Pachino
Cheat: Parking Meter
Drive over parking meters to empty cash into the streets. It's free money!
Submitted by wnagstaklown
Cheat: Fast Motion
During gameplay, press TRIANGLE, UP, RIGHT, DOWN, L2, L1, SQUARE.
Submitted by DJ Chadwick
Cheat: Instant Body Armor
To get body armor in an instant, press these buttons during gameplay: R1, R2, L1, X, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, UP.
Submitted by IGN Guides
Cheat: Low Gravity
During game play, press RIGHT, R2, CIRCLE, R1, L2, DOWN, L1, R1. Press UP while you accelerate to make the car hover off of the ground.
Submitted by danman
Cheat: Weapons
During gameplay, press the following for a smattering of weapons: R2, R2, R1, R2, L1, R2, LEFT, DOWN, RIGHT, UP, LEFT DOWN, RIGHT, UP. This will give you one weapon in every weapon class, including a flamethrower and Uzi. Mmmm.... carnage.
Submitted by Jon Probasco
Cheat: Health
To get instant health, enter this code during gameplay: R1, R2, L1, CIRCLE, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, UP.
Submitted by IGN Guides
Cheat: More Weapons
This batch includes the rocket launcher, machine gun, katana, grenades, pistol, shotgun, and uzi. During gameplay, press R1, R2, L1, R2, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, DOWN, LEFT.
Submitted by IGN Guides
Cheat: Raise Wanted Level By Two Stars
To bring the serious law-enforcement heat, enter this code during gameplay: R1, R1, CIRCLE, R2, LEFT, RIGHT, LEFT, RIGHT, LEFT, RIGHT.
Submitted by IGN Guides
Cheat: Speed Up Gameplay
To make everything go faster, press these buttons during gameplay: CIRCLE, CIRCLE, L1, SQUARE, L1, SQUARE, SQUARE, SQUARE, L1, TRIANGLE, CIRCLE, TRIANGLE. Notice the time flying by in the upper corner of the screen.
Submitted by IGN Guides
Cheat: Kill Yourself
To commit suicide on the stop, press these buttons (this will also reset your outfit): RIGHT, L2, DOWN, R1, LEFT, LEFT, R1, L1, L2, L1.
Submitted by IGN Guides
Cheat: Play as Different Characters (In Appearance Only)
To make Tommy look like another character, enter one of the cheats listed below during gameplay.
Red Leather: RIGHT, RIGHT, LEFT, UP, L1, L2, LEFT, UP, DOWN, RIGHT
Candy Suxxx: CIRCLE, R2, DOWN, R1, LEFT, RIGHT, R1, L1, X, L2
Hilary King: R1, CIRCLE, R2, L1, RIGHT, R1, L1, X, R2
Ken Rosenberg: RIGHT, L1, UP, L2, L1, RIGHT, R1, L1, X, R1
Lance Vance: CIRCLE, L2, LEFT, X, R1, L1, X, L1
Love Fist 1: DOWN, L1, DOWN, L2, LEFT, X, R1, L1, X, X
Love Fist 2: R1, L2, R2, L1, RIGHT, R2, LEFT, X, SQUARE, L1
Mercedes: R2, L1, UP, L1, RIGHT, R1, Right, UP, Circle, Triangle
Phil Cassady: RIGHT, R1, UP, R2, L1, RIGHT, R1, L1, RIGHT, CIRCLE
Ricardo Diaz: L1, L2, R1, R2, DOWN, L1, R2, L2
Sonny Forelli: CIRCLE, L1, CIRCLE, L2, LEFT, X, R1, L1, X, X
Submitted by IGN Guides
Cheat: Pedestrians Go Nuts
To make the pedestrians attack anything in sight, enter this code during gameplay: DOWN, LEFT, UP, LEFT, X, R2, R1, L2, L1. This one has similar results: DOWN, UP, UP, UP, X, R2, R1, L2, L2.
Submitted by IGN Guides
Cheat: Improve Driving Skill
To make yourself better behind the wheel, enter this code during gameplay: TRIANGLE, R1, R1, LEFT, R1, L1, R2, L1. Then press L3 to jump when in a vehicle.
Submitted by IGN Guides
Cheat: Make All Cars Explode
To blow up all cars at once, press R2, L2, R1, L1, L2, R2, SQUARE, TRIANGLE, CIRCLE, TRIANGLE, L2, L1 during gameplay.
Cheat: Turn Cars Black
To make all vehicles black, press these buttons during gameplay: CIRCLE, L2, UP, R1, LEFT, X, R1, L1, LEFT, CIRCLE.
Submitted by IGN Guides
Cheat: Turn Cars Pink
To make every vehicle a shade of pink, press these buttons during gameplay: CIRCLE, L1, DOWN, L2, LEFT, X, R1, L1, RIGHT, CIRCLE.
Submitted by IGN Guides
Cheat: Faster Traffic
To make the traffic speedier and less easy to jack, enter this code during gameplay: R2, CIRCLE, R1, L2, LEFT, R1, L1, R2, L2.
Submitted by IGN Guides
Cheat: New Tires
When your tire gets blown out enter R2, L2, L1, CIRCLE, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, UP.
Submitted by Sumblieuy
Cheat: Cars Float
To make cars able to drive on water, enter this code during gameplay: RIGHT, R2, CIRCLE, R1, L2, SQUARE, R1, R2. This cheat is helpful when going after hidden packages in the water.
Submitted by IGN Guides
Cheat: Attract Followers
To draw a crowd that follows you wherever you go, enter this code during gameplay: CIRCLE, X, L1, L1, R2, X, X, CIRCLE, TRIANGLE. (You can have your followers beat up other people if you hit them first.)
Submitted by Jason
Cheat: Change the Weather
To change the weather, enter one of the codes listed below:
Normal: R2, X, L1, L1, L2, L2, L2, DOWN
Rainy: R2, X, L1, L1, L2, L2, L2, CIRCLE
Foggy: R2, X, L1, L1, L2, L2, L2, X
Overcast: R2, X, L1, L1, L2, L2, L2, SQUARE
Sunny: R2, X, L1, L1, L2, L2, L2, TRIANGLE
Submitted by IGN Guides
Cheat: Lower Wanted Level By Two Stars
To make the cops automatically leave you alone, enter this code during gameplay: R1, R1, CIRCLE, R2, UP, DOWN, UP, DOWN, UP, DOWN.
Cheat: Even More Weapons
Even more weapons--chainsaw included! Press R1, R2, L1, R2, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, DOWN, DOWN during gameplay.
Submitted by IGN Guides
Cheat: Slow Motion
To make everything go in slow-mo, enter these buttons during gameplay: TRIANGLE, UP, RIGHT, DOWN, SQUARE, R2, R1.
Submitted by IGN Guides
