1, carefully check the appearance of the paint for color difference and scratches; Whether the door can be closed in one step, it is boring to hear a bang on the closed door.

2. Whether the tightness of the hood, fender and windshield or the gap left by the engine are consistent, and whether the glue paint of the original car is left; Open the hood and see if there are any traces of paint in it.

There should be only two buses on the battery. Generally speaking, a good machine has a clear sound and a strong sense of rhythm. The seat surface should be clean and intact, without damage or scratches; Need to remove the seat cover and look at the original seat cushion.

4. The exhaust system should be fastened, and the joint of muffler and three-way catalytic converter should be checked for possible leakage; Check whether the hanger and bracket of the exhaust pipe are damaged; Check the fuel system and oil circuit; Look for signs of oil leakage, but the suction of traffic air makes the leakage inconspicuous.

5. Check whether the coolant leaks. If the heater core or hose leaks, it can be found at the bottom of the vehicle, and coolant stains should be found around the clutch housing and engine compartment.

6. Testing project uses advanced, scientific and accurate testing instruments and methods to conduct detailed and necessary testing on each used car, instead of relying on experience and traditional methods to select used cars.