Start the game. Press [SHIFT] + [~] to open the game Console. Enter your codes.

Code	Effect
pl_addmoney [#]	(same effect as 'makemerich')
makemerich	1000000 gold added to local player
makemerich [#]	Adds the specified # of gold to your account (can be negative too, for whatever reason you would do that)
skipstage	Advance Stage (assumed this would skip a race of a championship/contract, but it seems to have no effect other than crashing the game if you run it too many times)
breakwin	Cause the windows on your vehicle to be broken
timescale [#]	Change the game speed
ai_enable [0/1]	Disable/Enable the Artificial Intelligence of enemy drivers
timescale	Display the current game speed
nightmare	Enemies enforced
robinhood	Players received/lost some money
transport	Teleports your vehicle to another location on the track
devilsmachine	Toggle all andrenalin devices mode (gives you most of the powerups along the top of the screen)
givemethepower	Toggle infinite adrenalin (used for Nitro Boost & Adrenalin Devices)
ghostintheshelter	Toggle Invisibility (makes enemy drivers ignore you?)
ghostintheshelter	Toggle Invisibility (makes enemy drivers ignore you?)
elixir	Toggle Invulnerability mode
lightspeed	Toggle max speed survive.
keymaster	Tracks unlocked (you must have a profile loaded for this to work, and you must not be in the track selection screen)
sidelights [0/1]	Turn the sidelights off/on (seems to be the rear lights on some vehicles)