Activate the following cheats by entering the corresponding codes at the code entry screen in Career mode. Most of these can only be used once:

CHEAT FUNCTION - CHEAT CODE
$10,000 - REGGAME
$10,000 - 1Mi9K7E1
$10,000 - CASHMONEY
$8,000 - L1iS97A1
$4,000 - W2iOLLO1
$2,000 - 1MA9X99
5 Free Repair Markers - SAFETYNET
Audi TT 3.2 Quattro(Career Mode) - ITSABOUTYOU
Castrol Syntec Vinyl - CASTROLSYNTEC
Chevrolet Chevelle SS(Career Mode) - HORSEPOWER
Coke Zero Volkswagen Golf GTI and Vinyl(Career Mode) - ZEROZEROZERO
Collector's Edition Cars - COLLECTORSED
Dogde Viper(Career Mode) - WORLDSLONGESTLASTING
Energizer Lithium Dodge Viper SRT10 and Vinyl(Career Mode) - ENERGIZERLITHIUM
K&N Vinyl - WORLDSLONGESTLASTING
Mitsubishi Lancer Evolution(Career Mode) - MITSUBISHIGOFAR
Re-lock Cars After Unlocking Everything - LEIPZIG
Unlock Everything - UNLOCKALLTHINGS