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.

Ask the exporter for a paint thickness gauge report, or request a live video where they measure the car in front of you. What to look for: · Factory paint on most Chinese cars measures 80–120 microns. Readings above 150–200 microns on a panel usually mean repainting; above 300 microns often means body filler (putty) underneath. · Inconsistent readings between panels (e.g., left door 95µm, right door 180µm) suggest the right side was repaired. · Check gaps between panels (doors, hood, trunk). Uneven gaps or misaligned headlights/bumper clips point to past collision repairs. · Look for overspray on rubber seals, plastic trim, or inside door jambs — a clear sign of repainting. · Check bolt heads on fenders, doors, and hood. Wrench marks or fresh paint over bolts mean the panel was removed. Combine these checks with an OBD scan for airbag or crash-related fault codes. Any repainting should be declared by the seller; if discovered undeclared, you have grounds to renegotiate or reject the car.

It's extremely difficult. The security level of Chinese brand immobilizers is very high, and you must connect a specialized factory computer to the vehicle's OBD and be online with the domestic server to match it. Losing all keys usually means you need to replace the entire lock cylinder and anti-theft control module while overseas.