18 Wheels of Steel: Extreme Trucker

Use a text editor to edit the "config.cfg" or "controls.def" file in the
"\my documents\18 WoS Extreme Trucker\" folder. Change the values of the
following lines:

uset g_console "0"
uset g_developer "0"

to:

uset g_console "1"
uset g_developer "1"

Then, press [~] during game play to display the console window.
Enter one of the following case-sensitive codes or key to
activate the cheat function. Press [~] again to close the console window.
cheat heal - restores the health of your truck and cargo (to be
entered while driving if your rig gets damaged)
cheat jobs_max - list all available jobs for current driver level (to be
entered during mission select screen)