I recently noticed the gasket that surrounds the bumper guard failing. When I brought the car in for service and the seat belt recall, the dealership replaced the entire piece ($200 part) on warranty. They have replaced several already this year. If you have this accessory, I'd check to see if the gasket is in tact. If not, bring it in. The stainless steel plate is thin and runs on the top of the bumper just below the back hatch.