Keeping you Ready for the Road Ahead™, the Dorman Nitrogen Oxide (NOx) Sensor Outlet is a high-temperature sensor in detecting NOx levels within diesel-fueled engines. This is in compliance with state emission standards and keeps you and the environment safe from the devastating effects of NOx, such as: chronic lung function breathing problems, headaches, and much more. These heavy duty NOx sensors are re-engineered for increased performance giving you a peace of mind you are in good hands. FleetPride is your First Click in Heavy Duty®.