Here are some cheats and tips for the game 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.
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”.