Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
NumPad1: Change Cash By 50000
NumPad2: Reveal All Part Condition
NumPad3: Full Parts Condition
Reveal All Part Condition: While active you instantly see each part condition.
Full Parts Condition: While active all parts have perfect condition.
Unlock more trainer options including updates from here - Train Mechanic Simulator 17 Trainer