PS2 Cheats:

Weapons Cheat:

Get Weapons #1: 
Press R1, R2, L1, R2, Left, Down, Right, Up, Left, Down, Right, Up.

Get Weapons #2: 
Press R1, R2, L1, R2, Left, Down, Right, Up, Left, Down, Down, Left. 

Get Weapons #3: 
Press R1, R2, L1, R2, Left, Down, Right, Up, Left, Down, Down, Down. 

Health and armor cheats:

Restore Health: 
Press R1, R2, L1, Circle, Left, Down, Right, Up, Left, Down, Right, Up. 

Armor: 
Press R1, R2, L1, X, Left, Down, Right, Up, Left, Down, Right, Up. 

Raise or lower wanted level:
Raise wanted level: 
Press R1, R1, Circle, R2, Left, Right, Left, Right, Left, Right. 

Lower wanted level: 
Press R1, R1, Circle, R2, Up, Down, Up, Down, Up, Down. 

Slow or fast gameplay:
Slow motion: 
Press Triangle, Up, Right, Down, Square, R2, R1. 

Faster play: 
Press Circle, Circle, L1, Square, L1, Square, Square, Square, L1, Triangle, Circle, Triangle 


Suicide: 
Press Right, L2, Down, R1, Left, Left, R1, L1, L2, L1. 

Pedestrian Cheats:

Robocops:
Press Circle, L1, Down, L2, Left, X, R1, L1, Right, X.

Women with guns: 
Press Right, L1, Circle, L2, Left, X, R1, L1, L1, X. 

Tommy groupies: 
Press Circle, X, L1, L1, R2, X, X, Circle, Triangle. 
Pedestrians riot: 
Press Down, Left, Up, Left, X, R2, R1, L2, L1 

Pedestrians attack: 
Press Down, Up, Up, Up, X, R2, R1, L2, L2. 

Pedestrians are armed:
Press R2, R1, X, Triangle, X, Triangle, Up, Down.

Pedestrians from Thriller:
Press Square, L1, Triangle, R2 Square, L1, L1. 

Traffic cheats:
Aggressive traffic: 
Press R2, Circle, R1, L2, Left, R1, L1, R2, L2. 

Pink traffic: 
Press Circle, L1, Down, L2, Left, X, R1, L1, Right, Circle. 

Black traffic: 
Press Circle, L2, Up, R1, Left, X, R1, L1, Left, Circle. 

Media Level Meter:
Press R2, Circle, Up, L1, Right, R1, Right, Up, Square, Triangle. 

Weather Cheats
Sunny weather: 
Press R2, X, L1, L1, L2, L2, L2, Triangle. 

Rainy weather: 
Press R2, X, L1, L1, L2, L2, L2, Circle. 

Foggy weather: 
Press R2, X, L1, L1, L2, L2, L2, X . 

Overcast weather: 
Press R2, X, L1, L1, L2, L2, L2, Square. 

Normal weather:
Press R2, X, L1, L1, L2, L2, L2, Down. 

Vehicles:

Cars float on water: 
Press Right, R2, Circle, R1, L2, Square, R1, R2.

Higher top speed: 
Press Right, R1, Up, L2, L2, Left, R1, L1, R1, R1. 

Change wheel size: 
Press R1, X, Triangle, Right, R2, Square, Up, Down, Square. 

Destroy cars: 
Press R2, L2, R1, L1, L2, R2, Square, Triangle, Circle, Triangle, L2, L1

Better driving skills: 
Press Triangle, R1, R1, Left, R1, L1, R2, L1. Press L3 or R3 to jump while driving. 

Flying Dodo car:
Press Right, R2, Circle, R1, L2, Down, L1, R1. 

Bloodring Banger: 
Press Up, Right, Right, L1, Right, Up, Square, L2. 

Bloodring Racer: 
Press Down, R1, Circle, L2, L2, X, R1, L1, Left, Left. 

Caddie: 
Press Circle, L1, Up, R1, L2, X, R1, L1, Circle, X. 

Hotring Racer 1: 
Press R1, Circle, R2, Right, L1, L2, X, X, Square, R1. 

Hotring Racer 2: 
Press R2, L1, Circle, Right, L1, R1, Right, Up, Circle, R2. 

Love Fist Limousine: 
Press R2, Up, L2, Left, Left, R1, L1, Circle, Right. 

Rhino tank: 
Press Circle, Circler, L1, Circle, Circle, Circle, L1, L2, R1, Triangle, Circle, Triangle. 

Romero's Hearse: 
Press Down, R2, Down, R1, L2, Left, R1, L1, Left, Right. 

Sabre Turbo: 
Press Right, L2, Down, L2, L2, X, R1, L1, Circle, Left. 

Trashmaster: 
Press Circle, R1, Circle, R1, Left, Left, R1, L1, Circle, Right.

Outfits 

Red Leather: 
Press Right, Right, Left, Up, L1, L2, Left, Up, Down, Right 

Candy Suxxx: 
Press Circle, R2, Down, R1, Left, Right, R1, L1, X, L2 

Hilary King: 
Press R1, Circle, R2, L1, Right, R1, L1, X, R2 

Ken Rosenberg: 
Press Right, L1, Up, L2, L1, Right, R1, L1, X, R1 

Lance Vance: 
Press Circle, L2, Left, X, R1, L1, X, L1 

Love Fist 1: 
Press Down, L1, Down, L2, Left, X, R1, L1, X, X 

Love Fist 2: 
Press R1, L2, R2, L1, Right, R2, Left, X, Square, L1 

Mercedes: 
Press R2, L1, Up, L1, Right, R1, Right, Up, Circle, Triangle 

Phil Cassady: 
Press Right, R1, Up, R2, L1, Right, R1, L1, Right, Circle 

Ricardo Diaz: 
Press L1, L2, R1, R2, Down, L1, R2, L2 

Sonny Forelli: 
Press Circle, L1, Circle, L2, Left, X, R1, L1, X, X

    Source: geocities.com/fatmanprime