During gameplay, press the following:

Get health - R, BLACK, L, B, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, UP
Get armor - R, BLACK, L, A, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, UP
Get weapons set #1 - R, BLACK, L, BLACK, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, UP
Get weapons set #2 - R, BLACK, L, BLACK, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, DOWN, DOWN
Get weapons set #3 - R, BLACK, L, BLACK, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, DOWN, LEFT
Change clothes - RIGHT, RIGHT, LEFT, UP, L, WHITE, LEFT, UP, DOWN, RIGHT
Commit suicide - RIGHT, WHITE, DOWN, R, LEFT, LEFT, R, L, WHITE, L
Increase wanted level - R, R, B, BLACK, LEFT, RIGHT, LEFT, RIGHT, LEFT, RIGHT
Decrease wanted level - R, R, B, BLACK, UP, DOWN, UP, DOWN, UP, DOWN
Display media level - BLACK, B, UP, L, RIGHT, R, RIGHT, UP, X, Y
Police get revived - B, L, DOWN, WHITE, LEFT, A, R, L, RIGHT, A
Attract ladies - B, A, L, L, BLACK, A, A, B, Y
Pedestrians riot - DOWN, LEFT, UP, LEFT, A, BLACK, R, WHITE, L
Pedestrians attack you - DOWN, UP, UP, UP, A, BLACK, R, WHITE, WHITE
Pedestrians get weapons - BLACK, R, A, Y, A, Y, UP, DOWN
Bikini sluts get weapons - RIGHT, L, B, WHITE, LEFT, A, R, L, L, A
Repair tires - BLACK, WHITE, L, B, LEFT, DOWN, RIGHT, UP, LEFT, DOWN, RIGHT, UP
Change car tire size - R, A, Y, RIGHT, BLACK, X, UP, DOWN, X
Improve car handling - Y, R, R, LEFT, R, L, BLACK, L (then press LEFT STICK to jump when inside a vehicle)
Increase car top speed - RIGHT, R, UP, WHITE, WHITE, LEFT, R, L, R, R
Cars float on water - RIGHT, BLACK, B, R, WHITE, X, R, BLACK
Cars have low gravity - RIGHT, BLACK, B, R, WHITE, DOWN, L, R (press UP while accelerating to make the car float)
Destroy car - WHITE, BLACK, L, R, WHITE, BLACK, Y, X, B, Y, WHITE, L
Destroy all cars nearby - BLACK, WHITE, R, L, WHITE, BLACK, X, Y, X, Y, BLACK, L
Pink cars - B, L, DOWN, WHITE, LEFT, A, R, L, RIGHT, A
Aggressive traffic - BLACK, B, R, WHITE, LEFT, R, L, BLACK, WHITE
Get Bloodring Banger - UP, RIGHT, RIGHT, L, RIGHT, UP, X, WHITE
Get Bloodring Racer - DOWN, R, B, BLACK, BLACK, A, R, L, LEFT, LEFT
Get Hotring Racer #1 - R, B, BLACK, RIGHT, L, WHITE, A, A, B, R (alternate code - R, B, Black, Right, L, White, A, A, X, R)
Get Hotring Racer #2 - BLACK, L, B, RIGHT, L, R, RIGHT, UP, B, BLACK
Get golf cart - B, L, UP, R, WHITE, A, R, L, B, A
Get Love Fist's limo - BLACK, UP, WHITE, LEFT, LEFT, R, L, B, RIGHT
Get Romero's hearse - DOWN, BLACK, DOWN, R, WHITE, LEFT, R, L, LEFT, RIGHT
Get Sabre Turbo - RIGHT, WHITE, DOWN, WHITE, WHITE, A, R, L, B, LEFT
Get Trashmaster garbage truck - B, R, B, R, LEFT, LEFT, R, L, B, RIGHT
Get Rhino tank- B, B, L, B, B, B, L, WHITE, R, Y, B, Y
Look like Lance Vance - B, WHITE, LEFT, A, R, L, A, L
Look like Ken Rosenberg - RIGHT, L, UP, WHITE, L, RIGHT, R, L, A, R
Look like Mercedes - BLACK, L, UP, L, RIGHT, R, RIGHT, UP, B, Y
Look like Candy Suxxx - B, BLACK, DOWN, R, LEFT, RIGHT, R, L, A, WHITE
Look like Phil Cassady - RIGHT, R, UP, BLACK, L, RIGHT, R, L ,RIGHT, B
Look like Hilary King - R, B, BLACK, L, RIGHT, R, L, A, BLACK
Look like Love Fist Guy #1 - DOWN, L, DOWN, WHITE, LEFT, A, R, L, A, A
Look like Love Fist Guy #2 - R, WHITE, BLACK, L, RIGHT, BLACK, LEFT, A, X, L
Look like Ricardo Diaz - L, WHITE, R, BLACK, DOWN, L, BLACK, WHITE
Look like Sonny Forelli - B, L, B, WHITE, LEFT, A, R, L, A, A
Speed up time - B, B, L, X, L, X, X, X, L, Y, B, Y (alternate code - B, B, B, X, X, X, X, X, L, Y, B, Y)
Slow motion - Y, UP, RIGHT, DOWN, X, BLACK, R (alternate code - Y, UP, RIGHT, DOWN, X, R, BLACK)
Fast motion - Y, UP, RIGHT, DOWN, X, L, WHITE
Clear weather - BLACK, A, L, L, WHITE, WHITE, WHITE, DOWN
Cloudy weather - BLACK, A, L, L, WHITE, WHITE, WHITE, Y
Very cloudy weather - BLACK, A, L, L, WHITE, WHITE, WHITE, X
Foggy weather - BLACK, A, L, L, WHITE, WHITE, WHITE, A
Stormy weather - BLACK, A, L, L, WHITE, WHITE, WHITE, B