The following are known GameShark Codes for Mobil 1 Rally Championship 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.

• Have All Cars
  D009CF7C 0006
  8009CF80 0018
  D009CF38 73EA
  8009CF3E 0017
• Point Modifier
  3001B20D 00??
• Stop Timer & Always Place 1st
  800F6FB4 06EC
• Difficulty Modifier
  3001AFDC 00??

Difficulty Modifiers

• 00: Hard
• 01: Medium
• 02: Easy
• Track Modifier
  8006AB0E 00??

Track Modifiers

Vauxhall Rally Of Wales
• 00: Clocaenag
• 01: Penmachno
• 02: Myherin
• 03: Hafren
• 04: Dyfi
• 05: Gartheiniog

Pirelli International Rally

• 06: Chirdonhead
• 07: Falstone
• 08: Kershope
• 09: Pundershaw
• 0A: Riccarton
• 0B: Newcastleton

Scottish Rally

• 0C: Twiglees
• 0D: Yair
• 0E: Cardrona
• 0F: Black Lock
• 10: Glentrool
• 11: Ae

The Seat Jim Clark Memorial Rally

• 12: Moons And Stars
• 13: Bothwell
• 14: Whitchester
• 15: Eccles
• 16: Langton
• 17: Fogo

Stena Line Ulster Rally

• 18: Hamiltons Fally
• 19: Tyrones Ditches
• 1A: Feeny
• 1B: Parkanaur
• 1C: Lisnamuck
• 1D: Tardree

Manx International

• 1E: Port Saderick
• 1F: Ballagyr
• 20: Curraghs
• 21: Tholt-Y-Will
• 22: Injerbreck
• 23: Cringle

2-Player Game

• 24: Foresters Creek
• 25: Frozen Forest
• 26: Sundown
• 27: Farmers Hazard
• 28: Palm Beach
• 29: Settlers