Mechanics maintain, inspect and repair cars and motorcycles, helping to keep vehicles safe, reliable and roadworthy. Work may include routine servicing, oil and filter changes, replacing worn components, checking brakes, steering, suspension, tyres and exhausts, and investigating warning lights, noises or changes in performance. Garages may work on particular makes or vehicle types, while others handle a broad range of models. Repair services can include engine, gearbox, clutch, cooling, fuel, electrical and air-conditioning work. Mechanics use diagnostic equipment to identify faults and may provide estimates, explain recommended repairs and fit replacement parts. Some workshops also offer tyre fitting, wheel alignment or pre-purchase inspections. MOT tests are carried out only by authorised test centres; a repair garage may arrange a test or complete work needed following a failure.