The following are known Action Replay Codes for F-Zero X on Nintendo 64 (N64).

Device Compatibility: Action Replay & GameShark

Master Code – Must Be On
DE067000 0000

Infinite Lives
800D8729 0005

Timer Always Zero
812C4BC0 0000

Always 1st Place
812C4BC2 0001

Infinite Energy
812C4B48 4326
812C4B4C 4326

Boost From Start
D02C4DA0 003F
802C4925 0050