Press Analog-stick Left + A + B + C-Down + C-Left after crashing. You will be immediately repositioned in the center of the track.
At the press start screen, press L+R,C-Left,C-Right,L+R, & then press Start. At the next screen, hold Z & press L until the cheat mode appears
At the press start screen, press L+R,C-Left,C-Right,L+R. Then at the options screen, hold Z & press L until the cheat mode appears.