This Inlet Nitrogen Oxides Nox Sensor is a direct replacement for Volvo and Mack trucks, with fitment options for CHU, VNL, and VNM models. It features blade and bullet terminals and four wires, with a sensor type of Nitrogen Oxide Sensor. The part number is 22303390, also known as 5WK97367, with a superseded part number of 102013 and 21479638. In addition, it has a manufacturer warranty of two years and is easy to install with a direct fit. This Nox Sensor is designed to measure the levels of nitrogen oxides in the exhaust system, ensuring that your truck meets emissions regulations.