What is the cheat code to make me impervious to harm? Also, I entered the God Mode and Infinite Ammo cheats in the console but they ain't seem to work. Someone here gave me the codes and I think they are correct.

D

Press Ctrl+Alt+~ or whatever is bound to your console.

type GOD and press tab I think it will display the full command for enabling GOD mode. Assuming you have the PC version.

The cheats were removed in the first patch so that won't work.