What licensing test is required for a mechanic?

Answer 1

If you want to work full time or expect a lot of business then yes. It protects you in court to a degree, as well as adds to your resume and reputation. Many customers will not hire an mechanic who is not certified. Most businesses will not either.

Answer 2

First of all - the mechanic will need to be licensed in the state he or she is working in. There are one or more certifications and that might vary from state to state. After the mechanic is licensed - there might be some specialty certifications that he or she may wish to pursue like a particular manufacturer line and so on.