From a technical perspective, China's "National VI B (China VI-b)" is one of the strictest emission standards globally, with limits on carbon monoxide, nitrogen oxides, and particulate matter that are even stricter than some of Europe's Euro VI standards. However, the two are not legally recognized by each other, depending on your country's import regulations.

A Certificate of Origin (CO) is an official document stating where the vehicle was manufactured. For imports from China, it matters more than many buyers expect. First, customs value: many countries apply duty rates based on the country of manufacture, not where you bought the car. A CO proves the vehicle is Chinese-built, which determines the correct tariff line—skipping it can mean reassessment, fines, or seizure at destination. Second, trade agreements: some countries have preferential tariffs for Chinese goods that only apply with a valid CO. Request a CO issued by the China Council for the Promotion of International Trade (CCPIT) or China Customs, not a self-printed form. Check that the VIN, engine number, and buyer details match your purchase documents exactly. Make receiving the CO a condition before your final payment, and keep the original—customs at destination will ask for it.

We will use a megohmmeter (insulation resistance tester) to measure the insulation resistance of the high-voltage bus. If the resistance value is below the national safety standard, it indicates a risk of leakage, and the vehicle will be deemed unqualified.