What does China V and China VI vehicles mean?

[AnnieMarie]

China V and China VI refer to the national standards for vehicle exhaust emission testing. There are certain differences between the China V and China VI emission standards. 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. Below is an introduction to the new China VI standard: 1. Added OBD (On-Board Diagnostics) inspection. If the vehicle displays a fault light or detects a fault code in the engine system, it will be considered unqualified, resulting in failure to pass the annual inspection. 2. Added inspection for 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 fail the annual inspection. 3. 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 for fuel consumption testing but adopts the stricter WLTC (Worldwide Harmonized Light Vehicles Test Cycle) as the emission test cycle.