The following are known GameShark Codes for The Land Before Time: Great Valley Racing Adventure on Sony Playstation (PS1).
These codes were also known as Action Replay Codes and in most cases will work on both devices.

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

• Start On Last Lap
  D005D8D0 0000
  8005D8D0 0002
• Stop Timer (Obstacles)
  8004D724 0000
• Unlock All Obstacles (Press L2)
  8005D8EE FFFF
• Have Speed Burst
  8004D6F0 0001
• Press L2 For Traction
  D007770A FEFF
  80083B4A CB09