* A Nitrogen Oxide (NOx) sensor is a device used in modern vehicles to monitor and control the levels of nitrogen oxides in the exhaust gases. It is a crucial component of the emissions control system as it helps the engine management system maintain compliance with environmental regulations. * NOx sensors work by measuring the concentration of nitrogen oxides, such as nitric oxide (NO) and nitrogen dioxide (NO2), in the exhaust gases. There are two types of NOx sensors commonly used: the NOx sensor 1 (located before the catalyst) and the NOx sensor 2 (located after the catalyst). * The NOx sensor operates using a ceramic sensing element that is capable of detecting the concentration of nitrogen oxides in the exhaust gases. This sensing element produces an electrical signal that is sent to the engine control unit (ECU). * The ECU uses the information from the NOx sensor to adjust the air-fuel mixture and optimize the combustion process. It can also use this data to control the operation of other emissions control components, such as the selective catalytic reduction (SCR) system. * If a NOx sensor fails or malfunctions, it can trigger a fault code in the ECU and cause the vehicle's check engine light to illuminate. It can also result in increased emissions, reduced engine performance, and potential damage to other components of the emissions control system.* If you suspect a problem with your NOx sensor, it is best to consult a qualified mechanic or technician who can accurately diagnose and repair any issues. They may need to use specialized diagnostic tools and equipment to properly diagnose the problem and replace the sensor if necessary. * Warranty: 1.Your warranty period begins on the date of purchase. We offer a one-year parts replacement warranty. 2.Not covered by the Limited Warranty Accident or Collision. Improper use, installation, maintenance or service.