A Comprehensive Analysis of Quality Inspection, Factory Audit and Certification for Volkswagen Auto Parts (16 Major Inspection Items)

2026年5月12日

As a leader in the automotive industry, the Volkswagen Group has an extremely strict control over the quality of its components. Taking Volkswagen as an example, this article systematically examines the inspection, factory verification, testing, and certification processes for automotive components, covering the entire quality control process from raw materials to finished products.
I. Automotive Material Testing (Incoming Inspection and Certification)
Polymer Materials: Mechanical mechanical properties, thermal properties, insulation electrical properties, chemical resistance, artificial accelerated aging, combustion tests, etc. - During the inspection, the material certification certificates need to be verified.
Reflective materials: dimensions, color, reflective performance, adhesion, impact resistance, abrasion resistance, color fastness, salt spray test, compression performance, bending strength, cracks, etc. - Sampling for inspection shall be conducted on-site during the inspection process.
Foam foam material: apparent density, compression deformation, hardness, tensile performance, water absorption rate, thermal conductivity, resilience, combustion performance, etc. - The factory inspection should verify the foaming process parameters.
Rubber materials: density, hardness, tensile/impact/bending performance, Mooney viscosity, thermal properties, combustion test, artificial accelerated aging, chemical resistance, oil resistance, etc. - Certification requires providing a third-party inspection report.
II. Inspection of Automotive Exterior Components (Final Product Inspection)
Applicable Products: Rear fenders, side panels, rearview mirror housings, engine hoods, exterior accessories, bumper strips, etc.
Test items: Mechanical mechanical properties, rigidity and strength, deformation amount, surface thickness, adhesion, corrosion resistance, wear resistance; high/low temperature/UV aging; sand/dust/flying stone tests; metallographic analysis, non-destructive testing; fatigue durability tests, etc. During the factory inspection, the calibration records of the environmental test chamber need to be verified.
III. Inspection of Automotive Interior Components (Safety and Environmental Certification)
Applicable Products: Steering wheel, door interior panel, power window switch, ceiling, sunshade, armrest, pillar trim, trunk, switch, seat, carpet, etc.
Test items: Heavy metal content analysis, VOC (volatile organic compounds), flame retardant performance, smoke and dust particles during combustion; high/low temperature / humidity / shock cycle; salt spray corrosion; ultraviolet / xenon arc light aging; mechanical impact / tension/compression / deformation; dust / mold spot environment; leather / textile performance; atomization test, etc. Certification requirements comply with GB/T 27630 and other interior air quality standards.
IV. Safety Airbag Inspection (Core of Safety Certification)
Electrical Test: Short-circuit resistance, module resistance, insulation test.
Mechanical tests: vibration, shock, and drop tests.
Acoustic test: Noise test.
Environmental tests: temperature shock, temperature-humidity cycling, high-temperature aging.
Sealing test: Dust-proof and water-proof (IP rating).
→ The airbags must be certified by CCC or ECE. During inspection, check the labels and inspection reports.
V. Tire Inspection (Performance and Durability)
Dimensions, high-speed performance, dynamic performance, static load, strength, durability, centrifugal test, tire tread wear, etc. During inspection, sampling should be conducted according to AQL standards, and the certification marks (such as 3C, ECE) should be verified.
VI. Inspection of Chassis Components (Structure and Fatigue)
Applicable Products: Transmission, starter, battery, synchronous belt, radiator, fan assembly, water pump, piping, clutch, fuel pump, filter, exhaust pipe, shock absorber, air conditioning compressor, etc.
Test items: Dimension, surface analysis, metallography, non-destructive testing, corrosion resistance, environmental aging, strength, functionality and fatigue durability testing. The factory inspection also requires checking the calibration and process control of the fatigue testing machine.
VII. Inspection of Vehicle Electronic and Electrical Equipment (EMC and Environment)
Applicable Products: Micro-motors, regulators, relays, horns, flashers, switches, wiring harnesses, connectors, fuses, ignition coils, windshield wipers, cigarette lighters, audio-visual systems, etc.
Test items: Electromagnetic Compatibility (EMC) anti-interference; High/low temperature/humidity/temperature shock; Mechanical vibration/shock/durability; Dust/rain/sulfuric acid/mold environment; Basic electrical parameters (current, voltage drop, noise, temperature rise, plug-in force, withstand voltage, etc.); Overload, insertion and removal life, fatigue tests, etc. The certification must comply with standards such as ISO 7637 and CISPR 25.
VIII. Vehicle Entertainment System Testing (Electrical Safety)
Parasitic Current, Start Jump Over Voltage, Over Voltage/ Voltage Drop Test, Battery Voltage Drop, Ripple Immunity, Open Circuit/ Ground Bias/ Power Supply Bias Test, Short Circuit Test, Insulation Evaluation, etc. During inspection, each unit needs to undergo a functional check.
IX. Connector Inspection (Electrical and Mechanical)
Electrical: Voltage drop, contact resistance, insulation, transient interruption.
Mechanical: Vibration, drop, impact, housing strength.
Environment: Temperature shock, temperature and humidity cycling, high-temperature aging, corrosion prevention.
Low-temperature awakening, high-temperature endurance, low air pressure, rapid temperature variation, constant temperature and humidity, condensation test.
Salt spray test, dust and water resistance (IP rating).
→ During factory inspection, it is necessary to verify the calibration of the salt spray chamber and the IP testing equipment.
X. Central Control Assembly Testing (Structure and Environment)
Mechanical shock, structural strength and stiffness, operational performance, modal analysis; noise test; dimensional stability, infrared light aging, temperature and humidity cycling. During the inspection, the appearance and operational feel should be compared with the confirmed sample.
XI. Dashboard Assembly Test (Durability and Environment)
Impact resistance, rigidity strength, operational performance, modal analysis; glove box/outlet/assembly durability; noise; dimensional stability, infrared light aging, temperature and humidity cycling. The certification must comply with standards such as GB 11552.
12. Door System Test (Function and Durability)
Electrical: Line resistance, overvoltage, thermal protection, current measurement.
Functions: Oscillating window motor's locked rotation force, glass friction force, high/low temperature function, melting, movement speed, anti-collision, operating noise.
Strength: Entry force, glass fixation, lateral test force without door frame.
Durability: Temperature stability, environmental durability, freezing test. → During inspection, it is necessary to simulate actual usage conditions.
13. Interior Door Testing (Strength and Environment)
Size stability under force load, stability of the decorative band area; Door handle force error, top surface vertical bearing capacity, pulling force, handrail bearing capacity; Durability of handrails, map bags, and door handles; Size stability, infrared light aging, temperature and humidity cycling; Noise testing. The factory inspection should pay attention to the injection molding and assembly processes.
14. Lighting System Inspection (Light Distribution and Durability)
Light distribution performance, luminance, color/ chromaticity, interior illuminance, focusing; temperature resistance, humidity resistance, vibration resistance, dust resistance, solvent resistance, strength, thermal shock, salt spray, water resistance, contact force, bulb photoelectric performance. Certification must be obtained through CCC or ECE. During inspection, light distribution tests are conducted in a dark room.
15. Oil Quality Inspection (Fuel and Lubricants)
Products: Gasoline, diesel, liquefied petroleum gas, lubricants, additives, etc.
Project: Octane number, cetane number, component analysis, sulfur content, metal ions, particle distribution, oxidation stability, benzene, nitrogen, density/viscosity, flash point/ pour point/ cold filter point, ash/moisture, distillation range, copper strip/silver strip corrosion, gum, alkenes/alkanes/fatty acids, oxides, lubricity, saturated vapor pressure, mercury content, etc. → The inspection should be entrusted to a qualified laboratory and a certification report should be issued.
16. Exhaust Emission Test (Environmental Certification)
Carbon monoxide, carbon dioxide, nitrogen oxides, sulfur dioxide, lead, phosgene, emission volume, etc. The certification must comply with emission standards such as National VI and European VI. During the inspection, it is conducted on the dynamometer test bench.
Summary: The inspection, factory verification, testing, and certification of Volkswagen's components cover all areas including materials, exterior, interior, safety components, chassis, electronics and electrical appliances, lighting, fuel, and exhaust emissions. The company should establish a complete factory verification system (including equipment calibration, process control, and personnel qualifications), and conduct inspections in accordance with international/national certification standards to ensure the quality of components and the safety of the entire vehicle. For more professional content, please continue to follow this column.