An OBD scan is one of the most cost-effective tools in a remote pre-purchase inspection, but you need to know what it can and cannot tell you. What it reveals well: current and stored fault codes across the engine, transmission, ABS, airbag, and body modules. A car with dozens of cleared codes in multiple modules may have electrical problems or a history of tampering. It also shows readiness monitors — if all monitors show 「not ready」 on a car that claims to be freshly serviced, the codes were probably cleared recently to hide something. What it reveals with the right software: live data. You can watch engine idle stability, coolant temperature under load, transmission shift behavior, and battery cell voltages on EVs. Abnormal fuel trims or misfire counters can flag worn injectors or coils before any warning light appears. What it cannot do: prove real mileage (odometers can be corrected digitally), detect physical accident repairs, or judge paint and rust. Practical advice: ask your inspector for a full-system scan report with screenshots, not just a 「no codes」 verbal summary. For Chinese brands, make sure the tool supports their protocols — mainstream scanners cover BYD, Geely, and Chery well, but some small brands need brand-specific software.

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.

As rubber seals age, "slight oil seepage (oil stains but no dripping)" is very common in used cars and is not considered a major fault. Our recommendation is: as long as the oil level does not drop abnormally, just clean and monitor it regularly after arrival, without the need to immediately incur high costs to disassemble and replace the seals.