An auto mechanic inspects, diagnoses, repairs, and maintains vehicles to ensure they are safe and reliable. Key duties include performing routine maintenance like oil changes and tune-ups, using diagnostic tools to identify problems, replacing or repairing faulty parts, conducting road tests, and keeping detailed records of all services performed. The job requires strong mechanical knowledge, problem-solving skills, attention to detail, and sometimes the ability to work with specialized systems like those in hybrid or electric vehicles.