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.

It must be stated objectively: used cars in China are produced according to national standards (GB) and have not been originally certified by Saudi SASO or GSO of Gulf countries. Buyers must find a local agent with customs clearance capabilities to complete the clearance through exemption documents or compliant modifications after arrival (such as wrapping or adding specific alarms).

4S dealership records are directly connected to the manufacturer's database, making the data hard to tamper with and the most reliable, with original parts guaranteed; third-party repair shops usually are not connected, making their data unverifiable. Therefore, we only consider the connected records from 4S dealerships as valid historical documentation.