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One month ago I changed my xenon headlight bulbs. A little pipe from the headlight falled. I put it again in place. This morning I found it on the floor near the tire. What is this pipe? Do I have to put it again in place? In green on the drawing
It's probably an open port to ensure the pressure on the inside of the headlight matches the outside. Typically this hose it aimed downward to avoid getting water into it.
I'd try to get the pipe back in place, it should just be a push is rubber hose onto the plastic nipple.
Fortunate for you I have a headlight just sitting in my garage so I can take a picture of it too...