First) the ontario college of trade is not a college. You can not go to this college. It is simply a way to make people think it is. Second) if you are a registered business, yes you need a trade license in Ontario. Not a business, Yes, You can work on anybodys vehicle without fear of being punished. Because the law in ontario states that you can have whoever you want to fix your vehicle. If it was an inforced law. Then everybody who works on their vehicle or a friends or neighbors or even a stranger. Then there would be alot of innocent people in getting fines. The auto industry wants people to think you dont have a choice so they can rob you. British Columbia, Manitoba, northwest territory, Nunavut, Newfoundland/Labrador- No license required.What Are the Certification Requirements?
How to Become a MechanicEach province and territory sets its own certification requirements. In British Columbia, Saskatchewan, Manitoba, Newfoundland and Labrador, the Yukon, the Northwest Territories, and Nunavut, certification for automotive service technicians is available, but is not legally required. You can still go through the steps above to complete an apprenticeship and receive a Certificate of Qualification (or similar credential), but it isn't mandatory that you do so.
In the other provinces, learning how to become a mechanic without school is impossible. That's because in those areas, the automotive trade is a compulsory trade. That means you do need a licence to be a mechanic. Here are the training requirements for the provinces that strictly regulate auto mechanics:
Prince Edward Island