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.