2015 Nissan Altima S 2.5
I noticed a funny-looking rubber "strap" hanging from the bottom of my car underneath the driver's door. It was held on at two points and one point apparently came loose.
I went to the dealership and the service manager said it was a very common problem with new Altimas. It took him about thirty seconds to fix it - amounted to him using a new pop rivet with a small collar on it. BAM! Fixed.
He did not even know its purpose, but said that many owners have come into the service department with the same issue on their cars.
Just a little FYI.