The following are known Action Replay Codes for Disney’s Herbie: Fully Loaded on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
e59de6a7
b3668f3f
4d0fdd7c
a7c40c64

Unlock All Tracks
2adde25e
bf09c48b