Can National 5 Vehicles Be Upgraded to National 6?

[Christopher]

Yes, upgrading components such as the three-way catalytic converter and the engine ECU logic can indeed improve the vehicle's emission standards. Here is the relevant information: 1. Reason: The emission standard of each vehicle is already documented in the new vehicle certificate at the time of production, so even if it meets the National 6 standard through various methods, it does not mean it is a "National 6 vehicle." Additionally, since European emission standards are ahead of those in China, many global models already meet the yet-to-be-announced National 6 standard. However, due to the domestic fuel quality not yet meeting the National 6 standard and only the National 5 standard being certifiable previously, these vehicles can only be recognized as National 5 models. 2. National 6: The full name of the "National 6" emission standard is: National Sixth Stage Motor Vehicle Pollutant Emission Standard. It is an upgraded standard based on China's domestic conditions for the "Limits and Measurement Methods for Emissions from Light-Duty Vehicles (China Fifth Stage)."