The HELLA NOx sensor, part number 6PN 358 307-091, is a critical component for modern diesel engines equipped with urea injection (AdBlue) systems. It accurately measures the concentration of nitrogen oxides in the exhaust gases, providing essential data to the engine control unit (ECU). By monitoring NOx levels, the ECU can optimize the urea injection process to effectively reduce harmful emissions. This contributes to meeting stringent environmental regulations and maintaining efficient engine performance. HELLA's commitment to quality ensures reliable and durable operation.