Ensure the door pin can go up and down.
Mercedes a class door lock bounce.
Take your mercedes benz for a test drive.
Mercedes benz c e clk w203 w209 w211.
Your door lock should not bounce up and down anymore.
This prevents the door lock pin from bouncing up and down when you lock the door or when the doors lock automatically.
Take 1 inch of electrical tape and apply it around the door lock pin.