Gearhead Garage: The Virtual Mechanic Cheats (PC)

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].

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.

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.