You will start by pressing ENTER during gameplay, then type one of the following codes:
BIG DOG: Dragster wheels
SMALL CAT: small front wheels
ENGINE: strong engine
MONEY: 100 000$
GOTMONEY: Unlimited Money
Press INSERT + HOME + PAGE UP on a job: Fast Task Completion
When you are in job mode, press [INSERT] + [HOME] + [PAGE UP]: The job will automatically finish, and you will get to keep your money but still get paid.
Press [DELETE] + [END] + [PAGE DOWN]: To fix any and all repairable parts while they are still on the car.
Take parts off your customers' cars, then enable the "FREE JOB" code. You will still have the parts under that car's name, and you will still get paid the full amount.
Complete all the jobs you can so that you will receive a message to say that there are no more jobs, Then get a cheap car from the auction and fix it up and try to sell it for more than $20,000. This will allow you to enter God-like mode.
Buy an old or new junk car from the auction, but do not repair it. Just buy a new car part from the catalog and replace it to make easy money. This cheat does not work on high-priced or third-party cars.
You need to enable the cheat codes in the Hidden Options menu, which is found in Extras. You have to hit "Save Career" for the changes to apply. Then you can use cheat codes in free roam and in your garage.
You will need to type in the code, no spaces or anything, and click the screwdriver. This may cause a lag.
BEGFORMONEY - Gives $100k
TESTME - You can get any car in the game, but this may crash the game
LETMEROC - You get teleported to the Race of Champions
REDDEVIL - you will get 1st place in the Red Devils' club
FILLMYGARAGE - adds all the cars in your garage, but this can cause a lag or crash