Some Of GTA San Andreas Cheat(ps2):

Cheat code warning
You should be careful on using cheat codes too frequently until you complete the mission where you save Madd Dogg from jumping off the casino rooftop. The game will prevent you from completing this mission if codes have been used excessively; this number appears to be cheats being used 500 or more times. When this number has been exceeded, Madd Dogg will jump off the roof in a few seconds, making it impossible to save him. Note: If you encounter this problem, enable the "Slow motion" or "Adrenaline effects" codes to get there faster. You still must be quick in order to save Madd Dogg.

Infinite health
While playing the game, press Down, X, Right, Left, Right, R1, Right, Down, Up, Triangle. If you entered the code correctly, a message will appear. Note: Falls, explosions, drowning, and vehicle rundowns are still harmful.

Infinite ammunition
While playing the game, press L1, R1, Square, R1, Left, R2, R1, Left, Square, Down, L1(2). If you entered the code correctly, a message will appear. You no longer need to reload, and will have unlimited ammunition for each new weapon that is picked up. Repeat this code to disable its effect.

Weapons (tier 1)
While playing the game, press R1, R2, L1, R2, Left, Down, Right, Up, Left, Down, Right, Up. If you entered the code correctly, a message will appear. The least powerful weapons in each category and rocket launcher will be unlocked. To get infinite ammunition for this or the other weapons tiers, repeatedly enable the code until no ammunition number appears beneath the gun pictures. Note: Enabling this code will cause your street creds to drop in points. You can check your creds in the stats menu at the pause screen. If you are in the negative, you are a Playa-Hater.

Weapons (tier 2)
While playing the game, press R1, R2, L1, R2, Left, Down, Right, Up, Left, Down(2), Left. If you entered the code correctly, a message will appear. The moderate powered weapons in each category will be unlocked, including the flame thrower and sniper rifle. Note: Enabling this code will cause your street creds to drop in points. You can check your creds in the stats menu at the pause screen. If you are in the negative, you are a Playa-Hater.

Weapons (tier 3)
While playing the game, press R1, R2, L1, R2, Left, Down, Right, Up, Left, Down(3). If you entered the code correctly, a message will appear. The high powered weapons in each category will be unlocked, including the chainsaw and lock-on bazooka. Note: Enabling this code will cause your street creds to drop in points. You can check your creds in the stats menu at the pause screen. If you are in the negative, you are a Playa-Hater.