A "bumper valance" is a part of a car that is located underneath the front or rear bumper. It is usually made of plastic and helps protect the bumper from damage and gives it a more streamlined appearance. Full definition
The exterior features Black Noise and gloss black accents, ranging in size from the Chrysler wing badges to the window trim, grille surrounds, wheels, and rear bumper valance molding. (hendrickchryslerdodgejeepramofconcord.com)
New software for the radar and camera — located in the front bumper valance and centre upper windscreen respectively — provides faster system response times, including faster pre-conditioning of the brakes to expect emergency pressure. (rolls-roycemotorcars-charleston.com)
Honda just said this «a race car for the road», they preview the next year's Civic TypeR, which features and aerodynamic body, with fender flares, lower bumper valances, lower skirts, a drop in stance and large wheels. (ps-garage.com)