Engine repair involves diagnosing and fixing issues within a vehicle's engine to ensure it runs efficiently. Common problems include overheating, poor fuel efficiency, and unusual noises. Technicians use specialized tools to identify the root cause of these issues, which may involve checking components like the spark plugs, fuel injectors, and timing belt. Once the problem is identified, repairs can range from simple fixes, such as replacing worn-out parts, to more complex procedures like rebuilding the engine. Regular maintenance, including oil changes and inspections, can help prevent major engine problems and extend the life of the vehicle.