The following are known GameShark Codes for NASCAR 98 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.

• Lap Time is 00:00:000
  800BF2FC 0000
• One Lap Needed to Finish Race
  800BF27A 0009
• Always Place 1st
  800BF2A8 0101