Gearhead Garage: The Virtual Mechanic

Free job:
When you are in job mode, press [Insert] + [Home] + [Page Up]. The job will automatically finish, you get to keep your money, will get paid.
Information in this section was contributed by cherubim14.

Fix parts:
To fix any and all repairable parts while they are still on the car without having to take them off, press [Delete] + [End] + [Page Down].
Information in this section was contributed by chris malone.

Free parts:
Take parts off people's cars then enable the "Free job" code. You will still have the parts under that car name and still get paid the full amount.

Hint: God-like mode:
Do all the jobs you can. After it says that there are no more jobs, get a cheap car from the auction, fix it up, and try to get more than $20,000, which will get you to God-like mode.
Information in this section was contributed by Roadrunner1304.

Hint: Easy money:
Note: This does not work on high priced or third party cars. Buy an old or new junker from the auction. Do not repair this car. Just take and buy a new car door from the catalog. Put the door or whatever part on the car and auction it. This will generally make anywhere from $78 to $1,000 profit.
Information in this section was contributed by just_a_cruzin.

Glitch: Bad file:
if there is a "_______.car" or "_______.spec" in your folder, you must remove it. This will cause the game to glitch and often only show a car with no parts. No one will bid on it, and it is easy to get for $125 but you must remove this file before playing the game.
Information in this section was contributed by just_a_cruzin.