Perform basic care and maintenance, including changing oil, checking fluid levels, and rotating tires. Repair or replace worn parts, such as brake pads, wheel bearings, and sensors. Perform repairs to manufacturer and customer specifications. Explain automotive problems and repairs to clients. An Auto Mechanic fixes vehicles and replaces their parts for customers. Their duties include repairing the vehicle's mechanical components, diagnosing problems with cars/ trucks and performing maintenance work on them as well. find and diagnose faults using hand tools or a computer. advise customers on what repairs are needed, including cost. repair or replace faulty parts and carry out regular maintenance. test vehicles on the road to check repairs.