Can anyone tell me how to unlock 2 player on the Cars PS2 game???

Answer 1

I cant find anything to unlock 2 player, but here are some codes for other goodies

At the cheat menu
Cheat:
YAYCARS -Unlock all Cars and paint jobs Playstation 2 Cheat codes ps2
CONC3PT- Infinite Boost Playstation 2 atomsfamily.net Cheat codes ps 2
VROOOOM- Fast start Playstation 2 Cheat codes ps 2
MATTL66 -Unlock all Art Playstation 2 Cheat codes ps2
FRANKSB - Play as Tractor Playstation 2 Cheat codes ps2
PEACEOT - Play as Fillmore Playstation 2 Cheat codes ps2
CASEDEL - Play as Luigi Playstation 2 Cheat atomsfamily.net codes ps 2
WATCHIT - Unlock all Videos Playstation 2 Cheat codes ps2
BOOTCMP - Play as Sarge Playstation 2 Cheat codes ps 2
CHEATER - Play as Boost Playstation 2 Cheat codes ps2
OLDY2D0 - Play as Lizzie Playstation 2 Cheat codes ps2
MONAR02 - Play as Monster truck #1 Playstation 2 Cheat codes ps2
GOOGLER - Play as Monster truck #2 Playstation 2 Cheat codes ps2
MUSIC8R - Play as Dj Playstation 2 Cheat codes ps 2
RACEKAR - Play as Flecher Playstation 2 Cheat codes ps 2
PIXARFY - Play as Woody the Wagon Playstation 2 Cheat codes ps2
MCQNL94 - Play as Mia and Tia Playstation 2 Cheat codes ps2
DUN33LI - Play as the #33 racecar Playstation 2 Cheat codes ps2
TORCHED - Play on Fire Playstation 2 Cheat codes ps 2
IF900HP - Unlock all mini games and Tracks Playstation 2 Cheat codes ps2

Answer 2

I didn't find anything about two player mode at all but I did find some other stuff if you want them.

Cars
All races:
Enter MATTL66 as a code.

All cars:
Enter YAYCARS as a code.

All tracks and mini-games:
Enter IF900HP as a code.

Maters Speedy Circuit and Maters Countdown cleanup:
Enter TRGTEXC as a code.
Jason Anderson.

Super fast start:
Enter IMSPEED as a code.
chimpysunk.

Unlimited boost:
Enter VROOOOM as a code.
htpi.

All paint jobs:
Enter R4MONE as a code.
harrises.

All movies:
Enter WATCHIT as a code.
harrises.

All concept art:
Enter CONC3PT as a code.
harrises.

Hint: Avoid getting lost:
If you ever get lost in the desert, follow Mater or any other car without bumping into them. They will take you back to Radiator Springs.
Jordan Miller.

Hint: Lightning bolt:
The first stripe (near the fire house) of the new road is actually a lightning bolt.
IdaFatBoy.