Can China 5 be upgraded to China 6?

[DelWilliam]

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