According to their purposes, engine components include the engine body, pistons, crankshaft, cylinder liners, valves, etc; Vehicle accessories include doors, windows, headlights, roof, rear wing, etc; Chassis accessories include chassis body, leaf springs, suspension system, steering system, braking system, etc; Electrical accessories include generators, batteries, ignition systems, control modules, sensors, etc.

According to materials, metal accessories are made of materials such as aluminum alloy, steel, copper, etc; Plastic accessories include materials such as polypropylene, polyamide, ABS, etc; Rubber accessories include tires, sealing rings, suspension rubber, etc.

Divided by usage cycle, there are original parts, referring to parts produced by automobile manufacturers; Brand accessories are produced by certified brands; The auxiliary accessories are produced by unverified manufacturers.

According to the country of production, there are domestic accessories, which are produced by domestic enterprises; Imported accessories are produced by foreign manufacturers.

In addition, there are other standards that classify engine components such as engine, engine assembly, throttle body, cylinder block, tensioner, etc; The transmission system accessories include clutches, transmissions, gear shift lever assemblies, reducers, magnetic materials, etc; Brake system accessories include brake master cylinder, brake cylinder, brake assembly, brake pedal assembly, compressor, brake disc, brake drum, etc; Steering system accessories include main pins, steering gears, steering knuckles, ball joints, etc; Walking accessories; Electrical instrument accessories; Automotive lighting fixtures; Automotive modification parts; Security and anti-theft accessories; Automotive interior accessories; Automotive exterior accessories; Comprehensive accessories; Audio and video electrical accessories; Chemical and physical components, etc.