OK type in the secret code 'UNLOCKALLTHINGS' and then instead of restarting the ps3 get out of your carrer and go back in (do this way because it's quicker to do than resartin the whole ps3.) and all the cars you unlocked should be there if you sell the you will probably get around 90,000 dollars.

Unlock Everything in the Game:
Enter the password 'UNLOCKALLTHINGS' to unlock ALL maps, cars etc.

Unlock ALL Bonuses:
Enter the password 'MASTERCODE' to unlock ALL the bonuses in Career mode.

Unlock Chevelle SS:
Enter the code 'HORSEPOWER' to unlock the Chevelle SS in Career mode.

Unlock Audi TT 3.8 Quattro:
Enter the code 'ITSABOUTYOU' to unlock the Audi TT 3.8 Quattro in Career mode.

Unlock Coke Zero Volkswagen Golf GTI:
Enter the code 'ZEROZEROZERO' to unlock the Coke Zero Volkswagen Golf GTI In Career mode.

Unlock Mitsubishi Lancer Evolution:
Enter the code 'MITSUBISHIGOFAR' to unlock the Mitsubishi Lancer Evolution in Career mode.

Unlock Energizer Lithium Dodge Viper SRT10:
Enter the code 'WORLDSLLONGESTLASTING' to unlock the Energizer Lithium Dodge Viper SRT10 in Career mode.

Unlock Castrol Syntec Decal:
Enter the code 'CASTROLSYNTEC' to unlock the Castrol Syntec decal in Vinyls.

Unlock Energizer Lithium Decal:
Enter the code 'ENERGIZERLITHIUM' to unlock the Energizer Lithium decal in Vinyls.

Unlock 5 Free Repair Markers:
Enter the password 'SAFETYNET' to get 5 free repair markers in Career mode (this password can only be used once).

Unlock Extra $2,000:
Enter the code '1MA9X99' to get an extra $2,000 in Career mode (this password can only be used once).

Unlock Extra $4,000:
Enter the code 'W2iOLLO1' to get an extra $4,000 in Career mode (this password can only be used once).

Unlock Extra $8,000:
Enter the code 'L1iS97A1' to get an extra $8,000 in Career mode (this password can only be used once).

Unlock Extra $10,000:
Enter the code 'CASHMONEY', 'REGGAME' or '1Mi9K7E1' to get an extra $10,000 in Career mode (this password can only be used once)

CASHMONEY $10,000 added to your account

Enter the "UNLOCKALLTHINGS" code. Exit to the main menu, reload Career mode, and you should now have the Nissan 240 SX, modern Pontiac GTO, Chevy Cobalt SS, and black Dodge Viper SRT 10 in your garage. Sell those four cars to get approximately $90,000. Then, save your career, and reset the game. Load your saved career. Enter the "UNLOCKALLTHINGS" code again. Exit to the main menu, reload Career mode, then go to your garage. The Nissan 240 SX, modern Pontiac GTO, Chevy Cobalt SS, and black Dodge Viper SRT 10 should be in your garage again. Repeat this process as much as desired and WHAMMO! Cash money.

Enter 'COLLECTORSED' as a code in the Collector's Edition to unlock the Acura Integra, Acura NSX, Audi RS4, Lexus IS350, and Pontiac Solstice GXP.

The Collector's Edition features 5 new cars, 4 new race days and 29 new events.

To enter these codes go to the 'Enter Code' menu which is located by going to 'Options' and then 'Career Mode'. It is advised that you disable 'Auto-Save' option as some of these codes can only be used once.

Unlock Chevelle SS:
Enter the code 'HORSEPOWER' to unlock the Chevelle SS in Career mode.

Unlock Audi TT 3.8 Quattro:
Enter the code 'ITSABOUTYOU' to unlock the Audi TT 3.8 Quattro in Career mode.

Unlock Coke Zero Volkswagen Golf GTI:
Enter the code 'ZEROZEROZERO' to unlock the Coke Zero Volkswagen Golf GTI In Career mode.

Unlock Energizer Lithium Dodge Viper SRT10:
Enter the code 'WORLDSLLONGESTLASTING' to unlock the Energizer Lithium Dodge Viper SRT10 in Career mode.

Unlock Extra $8,000:
Enter the code 'L1iS97A1' to get an extra $8,000 in Career mode (this password can only be used once).

Unlock Extra $10,000:
Enter the code 'CASHMONEY', 'REGGAME' or '1Mi9K7E1' to get an extra $10,000 in Career mode (this password can only be used once).

First go to the 'Enter Code' menu which is located by going to 'Options' and then 'Career Mode'. It is advised that you disable 'Auto-Save' option as some of these codes can only be used once and you may want to revert the game back to it's original setting. Enter the code "UNLOCKALLTHINGS"

Now go back to the career menu and select car lot, find the car called "ACURA INTEGRA" and buy it, as you see thaos car cost nothing, now go to your garage and find the car you just bought and sell it, you will receve 7,200 for it. Keep doing this untill you have the amount of miney you want.