Crysis 2 cheat codes:
Open the cheat console window by pressing [~] (or the key above [Tab]),
then enter:

con_restricted 0

and hit [Enter]. Now you can enter the following cheats:
g_godMode = 1 - God mode
g_infiniteAmmo = 1 - Unlimited ammo
i_unlimitedammo = 1 - Unlimited ammo
g_infinitesuitenergy=1 - Unlimited Suit Energy


-=Codes to change graphics and game settings=-
sys_spec_gameeffects = 3 []
sys_spec_objectdetail = 3 []
sys_spec_particles = 3 []
sys_spec_physics = 3 []
sys_spec_postprocessing = 3 []
sys_spec_shading = 3 []
sys_spec_shadows = 3 []
sys_spec_sound = 3 []
sys_spec_texture = 3 []
sys_spec_water = 3 []
ban (Command)
ban_remove (Command)
ban_status (Command)
ban_timeout = 30 [DUMPTODISK]
cl_fov = 75 []
cl_sensitivity = 16.5 [DUMPTODISK]
cl_sensitivityController = 0.8 [DUMPTODISK]
cl_sensitivityControllerMP = 0.6 [DUMPTODISK]
disconnect (Command)
disconnectchannel (Command)
gl_GameRules (Command)
gl_Map (Command)
g_gamespy_password = []
g_gamespy_server_region = 1 []
g_gamespy_unique_nick = []
g_skipIntro = 1 []
gl_Map (Command)
i_mouse_accel = 0 [DUMPTODISK]
i_mouse_accel_max = 100 [DUMPTODISK]
i_mouse_smooth = 0 [DUMPTODISK]
kick (Command)
kickid (Command)
map (Command)
net_lobby_gamespy_online_port = 64100 [DUMPTODISK]
net_lobby_gamespy_server_ping_wait = 10000 [DUMPTODISK]
pl_movement.power_sprint_targetFov = 75 []
quit (Command)
rcon_command (Command)
rcon_connect (Command)
rcon_disconnect (Command)
r_DrawNearFoV = 55 []
status (Command)
sv_bind = 0.0.0.0 [REQUIRE_LEVEL_RELOAD]
sv_gamerules = SinglePlayer []
sv_gamerulesdefault = SinglePlayer []
sv_password = [DUMPTODISK]
sv_servername = [DUMPTODISK]