Codes

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.
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 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 motion (slow down time): Press Triangle, Up, Right, Down, Square, R2, R1
Faster play (speed-up time): Press Circle, Circle, L1, Square, L1, Square, Square, Square, L1, Triangle, Circle, Triangle
Commit Suicide: Press Right, L2, Down, R1, Left, Left, R1, L1, L2, L1
Suicide: Press L2, Down, R1, Left, Left, R1, L1, L2, L1

Better driving skills: Press Triangle, R1, R1, Left, R1, L1, R2, L1. Press L3 or R3 to jump while driving.
Pedestrians riot: Press Down, Left, Up, Left, X, R2, R1, L2, L1
Pedestrians attack (hate you): Press Down, Up, Up, Up, X, R2, R1, L2, L2.
Pedestrians have weapons: Press R2, R1, X, Triangle, Up, Down

Aggressive traffic (drivers): Press R2, Circle, R1, L2, Left, R1, L1, R2, L2
Pink traffic: Press Circle, L1, Down, L2, Left, X, R1, L1, Right, Circle (or X)
Black traffic: Press Circle, L2, Up, R1, Left, X, R1, L1, Left, Circle

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

Hint:
HOW TO FIND A HELICOPTER
In the downtown district there is a condo that you can purchase as a safe house for $14000 on the opening that says roof access above the door there is a heli-pad, the helicopter should be there if its not leave and come back it may take a few tries but keep trying it will come eventually.