An auto mechanic inspects and repairs engines, brakes, and other parts of vehicles to identify and address problems. Their job is to diagnose issues quickly and accurately in order to provide cost estimates to customers. Auto mechanics typically work in dirty conditions while fixing car parts. Employers prefer applicants with a high school diploma who have taken courses in metal work, mechanics, science, math, and computers. While certification is not required, it can be beneficial. Mechanics also need the proper tools and an experienced staff to effectively service vehicles.