2000 E320 4 matic. A part has come loose near driver side rear wheel/trunk area. It is a square approximately 6 in x 6 in metall part with a narrow hose going in and out of it. What is it and how do I secure it/
A metal part about 6 in x 6 in with a narrow hose coming in and out of it is loose beneath the rear driver side bumper area. What is it and how do I secure it?