Bosch Nitrogen Oxide (NOx) sensors precisely measure the concentration of nitrogen oxides in the exhaust stream to ensure efficient SCR catalyst performance. By delivering real-time data to the ECU, NOx sensors enable accurate dosing of DEF, improved fuel efficiency, and compliance with strict emission standards. Built with advanced electrochemical sensing elements and robust housings to withstand extreme exhaust conditions, Bosch NOx sensors provide long service life and consistent accuracy. Bosch offers a full line of robust, durable, and accurate NOx sensors to the aftermarket with the same sensors currently trusted by OE manufacturers.