['After failing inspection, my friend offered to repair the required parts of my car with his own tools, I was confident he could do so for significantly cheaper than the garage.', 'He charged you?', 'Only for the required parts. He did the labor for free! I tipped him though, of course.', 'Did it all work out? Or did he completely mess up your car hah', 'He took the car to his own mechanic and it passed the inspection no problem. Probably saved about $500.']
Sounds like you've got a lot of faith in your friend.
After failing inspection, my friend offered to repair the required parts of my car with his own tools, confident he could do so for significantly cheaper than the garage.