My car had door checker problem. You can either replace or repair them. Repairing them is cheaper. I replaced all four of mine, but I took my old ones to a machine shop and had them repaired. Basically the ring part that connects to the body of the car (Not the part that connects to the door) gets worn out. So the machine shop opens the rivet on the ring and adds a shim or washer to the ring and puts the rivet back together. Now the ring part is tight again and its fixed.