Cheat mode
Select "Options" at the main menu. Then, select the "Player Profile" option, then choose "Enter Cheat". Enter one of the following case-sensitive code to activate the corresponding cheat function. 

1,500 credits
Enter $moneybags$ as a case-sensitive code.

All ATVs except G-Ride or Fury bike
Enter TO LAZY as a case-sensitive code.

G-Ride ATV
Enter GANGSTER as a case-sensitive code.

Ravage Talon ATVs
Enter +THREE as a case-sensitive code.

G-ride ATV
Enter pimpin as a code. All bikes except for the Fury
Enter All Access as a case-sensitive code.

All rider gear
Enter Duds as a case-sensitive code.

All rims
Enter Dubs as a case-sensitive code.

All exhaust pipes
Enter Smog test as a case-sensitive code.

All bike parts
Enter TRICK IT OUT as a case-sensitive code.

All events
Enter N0GAME as a case-sensitive code.

All music videos
Enter Billboards as a case-sensitive code.

All championship races
Press Square, Triangle, Left(2), Circle(2), L, R(2), Triangle at the main menu.