Cars cheats and cheat codes for Sony PSP

Unlock Speedway Reversed bonus track:
While you are at the main menu, hold L and press X, Square, Triangle, 
X, Triangle, Square.

Unlock character vehicles:
Unlock Doc Hudson - Win the Gran Prix Cup 1 once
Unlock Flo - Win the Gran Prix Cup 1 once
Unlock Sheriff - Win the Gran Prix Cup 2 once
Unlock Snot Rod - Beat Snot Rod in story mode.
Unlock Wingo - Beat Wingo in story mode.
Boost - Beat Boost in story mode.
Chick - Beat Chick in story mode.
DJ - Beat DJ in story mode.

Unlock Mirror Cup:
Get all postcards in the Postcard Rally races in Story mode to 
access Mirror Cup.

Unlock alternate paint colors for the indicated cars:
A different color will be unlocked depending on if you finish in 1st, 
2nd or 3rd place.

Chick: 
Beat the goal time for Speedway track in time trial mode.

DJ: 
Beat the goal time for Radiator Cap Run track in time trial mode.

Doc Hudson: 
Beat the goal time for Mesa Ravine track in time trial mode.

Lightning McQueen: 
Beat the goal time for Figure 8 track in time trial mode.

Luigi: 
Beat the goal time for Diesel Forest track in time trial mode.

Mater: 
Beat the goal time for Desert Canyon Dash track in time trial mode.

Sally Carrera: 
Beat the goal time for Radiator Springs track in time trial mode.

Sarge: 
Beat the goal time for Frank's Field track in time trial mode.

Sheriff: 
Beat the goal time for Ironhorse Junction track in time trial mode.

Snot Rod: 
Beat the goal time for Turbine Canyon in time trial mode.

Wingo: 
Beat the goal time for Interstate track in time trial mode.