
The methods to identify China V and China VI are: 1. Check the motor vehicle conformity certificate: The vehicle conformity certificate clearly records the emission standard of the vehicle; 2. Look for the vehicle list: Find the emission standard of the vehicle in the vehicle information column; 3. Check the conformity certificate: It indicates the corresponding emission standard; 4. Inspect the vehicle environmental protection label: There is a clear mark on the back of the environmental protection label on the front windshield of the car, which shows the vehicle emission standard. The automobile emission standard is: the regulation of the content of harmful gases such as carbon monoxide, hydrocarbons, nitrogen oxides, particulates, and carbon smoke emitted from automobile exhaust.

















Last time I bought a car, I specifically researched this. There are three most reliable places to check: First, look at the vehicle conformity certificate. The upper right corner clearly prints the standard number, either China 5 GB18352.5 or China 6 GB18352.6. Then check the environmental label at the lower left corner of the front windshield. The blue sticker for new car registration will indicate the emission stage. You can also crawl under the car to inspect the catalytic converter. China 6 models have two sensor probes, while China 5 only has one. Remember that most new cars after 2017 are China 6 compliant, but during the 2018 transition period, some automakers were still clearing China 5 inventory cars, so keep your eyes open.

Just finished the annual inspection and discovered a trick: checking the engine number is the most accurate. For China VI vehicles, the engine model on the nameplate ends with letters C/D/E, like CA4GC18D-31. The registration date on the vehicle license is also crucial—new cars nationwide after July 2019 must meet China VI B standards. Once, when helping a friend inspect a , I found that the QR code on the environmental information list scanned as China V, saving him 30,000 yuan in bargaining on the spot.

Nowadays, people often discuss this issue while queuing at the vehicle office. The simplest method is to check using the VIN (Vehicle Identification Number). The 10th letter 'L' corresponds to vehicles manufactured in 2020, which are China 6 compliant. You can also search for 'Motor Vehicle Environmental Protection Website' on your phone, input the VIN, and get instant results. Another characteristic of China 6 vehicles is a label near the fuel filler cap that says 'Please refuel with gasoline compliant with VI/B standards.' Gas station attendants mention that China 5 vehicles have a 'V' label instead.

With 20 years of experience in car repair and having disassembled over a thousand vehicles, the biggest difference between China VI and China V lies in the exhaust system: China VI vehicles are equipped with a three-piece set in the exhaust pipe—a three-way catalytic converter, a particulate filter, and an exhaust temperature sensor—making it far more complex than China V. When reading fault codes through the OBD diagnostic interface, China VI has 19 emission monitoring modules, compared to only 13 in China V. The difference is even more evident in annual exhaust emission inspections, where the hydrocarbon limit for China VI is half as strict as that for China V.

Recently encountered a pitfall while car shopping: the same model produced in March 2019 was China V emission standard, but by June production had switched to China VI. The salesperson said to check the 'Fuel Consumption Label' on the new car's window - the small print at the bottom states 'Complies with China VI standard'. Extra caution is needed in the market, as China V vehicles cannot be registered in key cities. A friend bought the wrong emission standard last year and had to register out-of-province, costing an extra 2,000 yuan annually for cross-province inspections.


