It's extremely difficult. Unauthorized modifications can lead to module current overload protection, resulting in a lock. In China, you need to use the factory online engineer account to reprogram it. It's basically impossible to perform online decoding overseas. We strongly warn against blindly modifying the electrical systems of modern integrated circuit vehicles.

China does not have a single public accident database like CARFAX, but you can still verify history from several sources. First, ask the exporter for the insurance claim records (出险记录). Major repairs go through insurance, and the claim history shows the date, amount, and damaged parts. A car with large claim amounts (over half its value) is effectively a total loss rebuild. Second, check the vehicle's registration certificate (机动车登记证书) for transfer history — multiple transfers in a short period often follow an accident. Third, run a VIN check through commercial platforms (paid, around 20-50 RMB) which aggregate insurance, maintenance, and auction data. Cross-check everything against a physical inspection: paint thickness readings on structural points, weld quality under the seals, and underbody photos. If the records and the physical condition do not match, walk away or demand a large discount.

Act fast and follow the paper trail you built before buying. First, document everything immediately: take photos and videos of the fault, note the date of arrival and the odometer reading. Most exporters offer a commercial warranty window (typically 15-30 days after arrival) for major components like the engine, transmission and high-voltage battery. Contact the exporter in writing with the evidence, referencing your contract's warranty clause. For minor issues, a common arrangement is that they air-freight the spare part to you or reimburse a capped repair amount at a local workshop. To protect yourself before purchase: get the warranty terms written into the sales contract, including response time, what is covered, and how parts compensation is calculated. Also ask which fast-wearing parts (brake pads, filters, wipers) they recommend buying together with the car, so you are not stuck waiting for a small part from overseas.