That only applies to the original Doom 3. Doom 3 BFG is a remade version of Doom 3 and the console is disabled by default in it.


To enable the console in Doom 3 BFG, do the following:

Create a shortcut in Windows to your Doom 3 BFG executable file (I like to keep the shortcut in the same directory as the original executable, but you can really put it anywhere you want) and add the following to the end:

+seta com_allowconsole 1

So, the new shortcut will have this command line:

"Doom 3 BFG\Doom3BFG.exe" +seta com_allowconsole 1

I also like to increase the fov with command line command


+set g_fov 90



Then, you can enable the console in game. Here are some other Console Codes

god – God mode
noclip – No clipping mmode
editor – Opens level editor (Crash Warning!)
give all – Gives all weapons, full ammo, full health and armor
give weapon_ – Gives a weapon; shotgun, chaingun, chainsaw, flashlight, machinegun, pistol, plasmagun, rocketlauncher, bfg
notarget – AI ignores the player
give berserk – Gives Berserk
give health – Full health
give pda – Give all PDAs and video disks found in the current level
pm_thirdperson 1 – Activates third-person mode, type “0″ to replace “1″ to turn off.
killMonsters – Kills all monsters on the current level
kill: Suicide
pm_walkspeed ### – Changes player walk speed
pm_runspeed ### – Changes player run speed
pm_crouchspeed ### – Changes player crouch speed
pm_jumpheight ### – Changes player jump height
pm_noclipspeed ### – Changes noclip mode movement speed
clearLights – Removs all lights
testLight – Generate new light

Map Codes

Code:
map [map] – Loads named level, Example: map game/alphalabs1

Map List:
game/alphalabs1
game/alphalabs2
game/alphalabs3
game/alphalabs4
game/caverns1
game/caverns2
game/comm1
game/commoutside
game/cpu
game/cpuboss
game/delta1
game/delta2
game/delta3
game/delta4
game/delta5
game/enpro
game/hell1
game/hellhole
game/mars_city1
game/mars_city2
game/admin
game/mc_underground
game/monorail
game/mp/d3dm1
game/mp/d3dm2
game/mp/d3dm3
game/mp/d3dm4
game/mp/d3dm5
game/pdas
game/recycling1
game/recycling2
game/site3

Spawn Monster Codes

Code:
spawn monster_[EnemyType]_[EnemyName] – Spawns named monster, Example: spawn zombie_maint_wrench

Monster List:
zombie_maint_bald
zombie_maint_nojaw
zombie_maint_skinny
zombie_maint_wrench
zombie_maint_flashlight
zombie_maint
zombie_maint2
zombie_maint_fast
zombie_labcoat_skinny
zombie_labcoat_neckstump
zombie_labcoat_limb
zombie_labcoat_pipe
zombie_suit_skinny
zombie_suit_bloodymouth
zombie_suit_neckstump
zombie_tshirt_bald
zombie_tshirt_blown
zombie_fat
zombie_fat2
zombie_fat_wrench
zombie_bernie
zombie_sawyer
zombie_commando
zombie_commando_cgun
zombie_morgue
zombie_boney
zsec_pistol
zsec_shotgun
zsec_machinegun
zsec_shield
demon_imp
demon_imp_crawler
demon_maggot
demon_wraith
demon_pinky
demon_trite
demon_tick
demon_revenant
demon_cherub
demon_mancubus
demon_archvile
demon_hellknight
flying_lostsoul
flying_cacodemon
boss_vagary
boss_guardian
boss_guardian_seeker
boss_sabaoth
boss_cyberdemon
flying_forgotten
demon_d3xp_vulgar
demon_d3xp_bruiser