Faster cars
PS2 Cheat by: blackknight 
Spawn a hovercraft
Press Triangle, Triangle, Square, Circle, X, L1, L2, Down, Down.
Spawn a Hydra
Press Triangle, Triangle, Square, Circle, X, L1, L1, Down, Up.
Spawn an ATV
Press Left, Left, Down, Down, Up, Up, Square, Circle, Triangle, R1, R2.
Spawn Bloodring Banger
Press Down, R1, Circle, L2, L2, X, R1, L1, Left, Left.
Spawn Caddy
Press Circle, L1, Up, R1, L2, X, R1, L1, Circle, X.
Spawn Dozer
Press R2, L1, L1, Right, Right, Up, X, L1, Left.
Spawn Dozer
[Submitted by: gamestatus ]
During game play press R2, L1, L1, RIGHT, RIGHT, UP, UP, X, L1, LEFT
Spawn Escalade
Press R1, R2, L1, Triangle, Square, Circle, R1, L1
Spawn Hotring Racer 1
Press R1, Circle, R2, Right, L1, L2, X, X, Square, R1.
Spawn Hotring Racer 2
Press R2, L1, Circle, Right, L1, R1, Right, Up, Circle, R2.
Spawn Hunter
Press Circle, X, L1, Circle, Circle, L1, Circle, R1, R2, L2, L1, L1.
Spawn jetpack Alternate
Press R1, R2, L1, L2, Up, Down, 
Left, Right. Do the whole cheat 2 times.
Spawn jetpack
Press Left, Right, L1, L2, R1, R2, Up, Down, Left, Right, Left
Spawn Jetski
Press Up, Down, Left, Right, Circle, Circle, L1, R1
Spawn monster truck
Press Right, Up, R1, R1, R1, Down, Triangle, Triangle, X, Circle, L1, L1.
Spawn parachute
Press Left, Right, L1, L2, R1, R2, R2, Up, Down, Right, L1.
Spawn Ranger
Press Up, Right, Right, L1, Right, Up, Square, L2.
Spawn Rhino tank
Press Circle, Circle, L1, Circle, Circle, Circle, L1, L2, R1, Triangle, Circle, Triangle.
Spawn Romero
Press Down, R2, Down, R1, L2, Left, R1, L1, Left, Right.
Spawn Stretch
Press R2, Up, L2, Left, Left, R1, L1, Circle, Right.
Spawn stunt plane
Press Circle, Up, L1, L2, Down, R1, L1, L1, Left, Left, X, Triangle.
Spawn Tanker
Press R1, Up, Left, Right, R2, Up, Right, Square, Right, L2, L1, L1.
Spawn Trashmaster
Press Circle, R1, Circle, R1, Left, Left, R1, L1, Circle, Right.
Sports Car Traffic
Press Up, L1, R1, Up, Right, Up, X, L2, X, L1.
Press Right, R1, Up, L2, L2, Left, R1, L1, R1, R1.
Adrenaline Mode
Press X, X, Square, R1, L1, X, Down, Left, X.
Affectionate women
Press Circle, X, L1, L1, R2, X, X, Circle, Circle.
Aggressive traffic
Press R2, Circle, R1, L2, Left, R1, L1, R2, L2.
All Cars Nos
Press Left, Triangle, R1, L1, Up, Square, Triangle, Down, Circle, L2, L1, L1.
All Taxis Have Nitro
Press Up, Left, Left, Down, Circle, Square, L1, L1, L2, R1, R2.
All Traffic is Crap Cars
Press L2, Right, L1, Up, X, L1, L2, R2, R1, L1, L1, L1.
All Traffic is Hillbilly w/o Hillbilly Gear
Press Triangle, Left, Square, R2, Up, L2, Down, L1, X, L1, L1, L1.
Always Midnight
Press Square, L1, R1, Right, X, Up, L1, Left, Left.
Armor, health, money, and street creds
Press R1, R2, L1, X, Left, Down, Right, Up, Left, Down, Right, Up.
Army Helicopter
Press Circle, X, L1, Circle, Circle, L1, Circle, R1, R2, L2, L1, L1.
Beach Party
Press Up, Up, Down, Down, Square, Circle, L1, R1, Triangle, Down.
(Cannot be turned off)
Press Down, Up, Up, Up, X, R2, R1, L2, L2.
 
Call nearest pedestrian to get in your vehicle
Press X, Square, Down, X, Square, Up, R1, R1.
Cars fly away
Press Square, R2, Down, Down, Left, Down, Left, Left, L2, X
Cars Fly
UP, DOWN, L1, R1, L1, RIGHT, LEFT, L1, LEFT
Chaos Mode
Press L2, Right, L1, Triangle, Right, Right, R1, L1, Right, L1, L1, L1.
Fast motion
Press Triangle, Up, Right, Down, L2, L1, Square.
Fatty
Press Triangle, Up, Up, Left, Right, Square, Circle, Down.
Flying boats
Press R2, Circle, Up, L1, Right, R1, Right, Up, Square, Triangle.
Flying cars
Press Square, Down, L2, Up, L1, Circle, Up, X, Left
Foggy weather
Press R2, X, L1, L1, L2, L2, L2, X.
Four-star wanted level
Press R1, R1, Circle, L1, Up, Down, Up, Down, Up, Down.
Funhouse Theme
Press Triangle, Triangle, L1, Square, Square, Circle, Square, Down, Circle.
Gang members spawn faster
Press Left, Right, Right, Right, Left, X, Down, Up, Square, Right.
Get 6 Star Wanted Level
Press Circle, Right, Circle, Right, Left, Square, X, Down.