In order to input cheat codes, you will need to go to the New Profile page.
On this page, you can enter cheat codes by holding the ZR button and selecting the letters with the L button.
Once the code has been entered select “End” with the L button and you will see a prompt confirming the cheat code.
Unlock All Cheat Codes: RRTANGENTABACUS *
Auto Pilot: Enter the code above for All Cheats, then hold repair and drift simultaneously during a race.
Unlock Mirror Mode: RRTHEBEAST *
Unlock Cy Yunga (Replaces Bullseye Navior): RRCYYUN
Unlock Jinn Reeso (Replaces Mars Guo): RRJINNRE
Invincibility: RRJABBA *
Access Cheats Menu: RRDEBUG
** These cheat codes will also unlock the Cheats Menu, you can access it by pausing a race and pressing the following buttons on the D-pad: Up, Left, Down, Right, Up, Left, Down, Right.