What does China V and China VI vehicles mean?

[Walker]

China V and China VI vehicles refer to the national standards for vehicle exhaust emission testing. Here are the relevant introductions: 1. There are certain differences between the China V emission standard and the China VI emission standard. 2. The China VI testing standard increases the difficulty of exhaust emission testing compared to the China V standard, and introduces new regulations for the emission standards of newly manufactured vehicles. 3. The China VI standard adds an OBD (On-Board Diagnostics) system check. If the vehicle's fault light is on or fault codes are detected in the engine system, it will be deemed unqualified and unable to pass the annual inspection. 4. The China VI standard adds checks for the readiness status of the engine system, such as whether the oxygen sensor is in the ready state or whether the three-way catalytic converter is in the ready state. If none of these are in the ready state, the vehicle will not pass. 5. The China V regulation uses the NEDC (New European Driving Cycle) for both emission and fuel consumption tests. The China VI regulation still uses the NEDC as the fuel consumption test cycle but adopts the stricter WLTC (Worldwide Harmonized Light Vehicles Test Cycle) as the emission test cycle.