Ask about the abnormal sound in the car.

Your symptoms are the same as mine. Is there any vibration when you knock on the back of the back seat with your hand when the back seat is not lying well? I used to wrap Teflon tape around the lock lever, but I still couldn't completely solve the abnormal sound. I removed the back seat half a year ago (just two screws, very simple), and then took it home to remove the chair cover from below (also very simple). Open the sponge and you can see that the steel pipe is close to the steel plate.