Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
NumPad1: Increase Money By 5000
NumPad2: Increase EXP By 500
NumPad3: Increase Jobs By 1
NumPad4: Unlock All Upgrades
NumPad5: Perfect Parts Condition
NumPad6: Perfect Body Condition
NumPad7: Reveal Condition Of All Parts
NumPad8: Always Unmountable
NumPad9: Fast Unmount
Increase Money / EXP / Jobs: Press hotkey to add more money / exp or jobs.
Unlock All Upgrades: Press hotkey to instantly unlock all upgrades. For the game to register unlocks you will need to have a specific player level depending on the upgrade. If you are at the beginning and use unlock upgrade option, you will need to add EXP as well to see the upgrades unlocked.
Perfect Parts Condition: While active open the car status screen and all parts are fully repaired.
Perfect Body Condition: While active open the car status screen and the body condition is perfect. Requires that body parts are not dismounted (does not work for things in your inventory).
Always Unmountable: While active you can unmount all parts without mounting other parts first.
Fast Unmount: While active it takes a single click to remove a part (no more screws!)
Unlock more trainer options including updates from here - Car Mechanic Simulator 2018 Trainer