Cars Cheat Codes

Boost
Defeat Boost during story mode.

Chick
Defeat Chick during story mode.

DJ
Defeat DJ during story mode.

Doc Hudson
With the Gran Prix Cup 1

Sheriff
Win the Gran Prix Cup 2.

Snot Rod
Defeat Snot Rod during story mode.

Wingo
Defeat Wingo during story mode.

Alternate paint colors
Beat the goal time for one of the following tracks in Time Trial mode to unlock an alternate paint color for the indicated car. A different color will be unlocked depending on if you finish in first, second or third place.
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Lightning McQueen: Figure 8 track
Mater: Desert Canyon Dash track
Sally Carrera: Radiator Springs track
Wingo: Interstate track

Turbine Canyon: Shortcut
The first shortcut is where there is about five or six obstacles. Jump or drive over them.

Speedway Reversed bonus track
Hold L and press X, Square, Triangle, X, Triangle, Square at the main menu.