Various cheats
     Type in the codes in the Secret Codes menu in career mode:

Cheat code:             Effect:
mastercode              Unlock everything
unlockallthings         Unlock everything
safetynet               5 free repair marker
horsepower              Engine upgrade

Geld (im Karrieremodus)

1MA9X99                 Plus $2.000
W2iOLLO1                Plus $4.000
L1iS97A1                Plus $8.000
cashmoney               Plus $10.000
1Mi9K7E1                Plus $10.000
LEIPZIG                 Plus $10.000
reggame                 Plus $10.000 and a few cars

Autos

cokezero                VW Coke Zero Golf GTI
onlinesubaru            Subaru Impreza WRX Sti
mitsubishigofar         Mitsubishi Lancer Evolution
zerozerozero            VW Golf GTI
itsaboutyou             Audi TT
worldslongestlasting    Dodge Viper SRT10
unlockallthings         Nissan 240SX, Pontiac GTO, Chevrolet Cobalt SS 
                        and Dodge Viper
collectorsed            Acura NSX, Acura Integra, Audi RS4, 
                        Lexus IS350, Pontiac Solstice GXP

Parts

energizerlithium        Lithium Energize Vinyl frei
castrolsyntec           Castrol Syntec Vinyl frei