I had been out earlier in the day on some forest roads (no sure that mattes, but mentioning that in case it does) and after returning home, about 90 - 120 minutes later I hear this noise coming from under the car. Sounds like a small compressor running kind of sound. When I touch the part in the picture you can feel it is clearly vibrating and nothing else around it was. I lifted the spare cover to look in there and saw nothing and felt nothing, though I could hear it thru the car. Anyway, any ideas? If not I'll just ask the dealer at the next service.
This is right behind the spare well, almost dead center (left to right) of the car, that other piece is to the left side of the car ( appears right in the picture)
This is right behind the spare well, almost dead center (left to right) of the car, that other piece is to the left side of the car ( appears right in the picture)