The following are known Action Replay Codes for South Park Rally on SEGA Dreamcast (Dreamcast). These codes were also known as GameShark Codes and in most cases will work on both devices.

Device Compatibility: Action Replay & GameShark

Infinite Credits
3009C1B8 0009

Have All Tracks
8108875A FFFF

All Races open
46BA1AA1
0000FFFF

All Racers unlocked
800A320C FFFF

Have All Races
81088756 FFFF

Must Be On (M)
F106E870 0000
F106E872 0000

Infinite credits
FBCDD305
00000005

All Tracks unlocked
800A3210 FFFF

Infinite Credits
8008D659 0005

All Characters and Extra Cheats enabled
800A3208 FFFF
800A320A FFFF

All Cheats and Chars open
E8871DFC
0000FFFF
282F662D
0000FFFF

Unlock All Characters & Extra Cheats
81088750 FFFF
81088752 FFFF

All Tracks open
5F87723F
0000FFFF