I don't have them on my Honda but I have them on several other vehicles. You should not be getting any noise and less you're close to something. I thought I had a sensor failure on my BMW. I check the front bumper and found I had a large insect splat on the sensor. Cleaned it off and everything was good. First thing I would do is check for debris. If it's not debris on the bumper of the first thing I would do is head to the dealer. Because what you're describing is not normal.