The NOx sensor is a device used in vehicles and industrial engines to measure the concentration of nitrogen oxides (NOx) in the exhaust gases. Nitrogen oxides are pollutants that contribute to smog and acid rain, so controlling their emissions is crucial for environmental and regulatory reasons.
In vehicles, NOx sensors are part of the emission control system. They help ensure that the engine runs efficiently and that the emission control systems, such as selective catalytic reduction (SCR) or lean NOx traps (LNT), are working properly. The sensor sends data to the engine control unit (ECU), which adjusts the fuel-air mixture and other parameters to reduce NOx emissions.