Every time the car shuts down, there will be a bang on the door! Please answer someone who knows the car or meets the same situation!

1, which may be the sound of the sensor on the engine or the electronic throttle. I suggest you open the key first, then turn it off before checking. If there is still sound, go to the repair shop to check whether there is something wrong with the sensor or the circuit!

/2, it should be the sound of the exhaust pipe expanding with heat and contracting with cold. Listen to the gas in the exhaust pipe. If it is the sound produced by the expansion and contraction of the exhaust pipe, it is normal.