The following are known Game Genie Codes for Lethal Weapon on Nintendo Entertainment System (NES).

• OLSSGSOO
  Infinite ammo when shooting on the ground
• AKVIXAAP
  E restores Energy fully
• AEVIXAAP
  E worth nothing
• AKKSEAAP
  Extra ammo restores Energy fully
• AEKSEAAP
  Extra ammo worth nothing (if you run out of ammo you cannot use your gun till the next Stage)
• AEUYXAAZ
  No Energy loss when falling off the screen
• AKUYXAAZ
  Falling off the screen is fatal
• NNNISAAU
  Bullet Proof Vest lasts longer
• XVUKOOXK
  Bullet Proof Vest lasts until the end of stage except when you die from punches or falling off the screen
• XTUGTXXK
  Start on Level 2
• XZUGLXVL + LAUGGZNP + XTUGIZEK
  Start on Level 3
• OUSSISOO + OUXIPSOO
  Infinite ammo when shooting in the air
• ZENISAAU or AONISAAL
  Bullet Proof Vest does not last as long