The Nitrogen Oxide (NOx) Sensor, No. 904-6038, from Dorman Products has been made to match the original equipment sensor on certain Ford 2012-11 vehicles, with specified V8 406 6.7L (6651cc) and L6 408 6.7L engines. It is designed to properly restore nitrogen oxide detection to comply with emissions regulations. This replacement NOx sensor matches the function and performance of the original sensor on specified vehicles, OE Nos. BC3Z9D378C, BC3Z9D378D, BC3Z9D378E, BC3Z9D378F, BC3Z9D378G.