They use testing equipment to gather information. This includes engine analyzers, compression gauges, and spark plug testers. Once they find the problem, mechanics usually consult with the owner about repairs before they are made. If the owner decides they want the problem repaired, mechanics make the adjustments or repairs. The ability to figure out the source of the problem accurately and quickly is one of the mechanic's most valuable skills.
Mechanics use a variety of tools in their work.
As cars become more computerized, mechanics must know how to use more complex equipment. This equipment includes computerized diagnostic devices. In smaller shops, mechanics do all types of repair work. This ranges from simple tune-ups to complete engine overhauls and rebuilds. In larger shops, they may specialize in one area.