We use two steps: 1. Insert a medical-grade endoscope through the spark plug hole to visually inspect cylinder wall scratches and carbon buildup on the piston top; 2. Extract an engine oil sample to check for large metal debris or emulsification (caused by coolant leakage).

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.

We have established a database of target country policies. Check the specific requirements of the destination country in advance regarding vehicle age (left-hand/right-hand drive), emission standards (Euro 4/Euro 5), and steering position (left-hand/right-hand drive) to avoid customs clearance issues upon arrival.