Genuine OEM Audi Reducing Agent Injector, part number 03N131113D. This valve is responsible for precisely injecting a reducing agent, such as AdBlue or Diesel Exhaust Fluid (DEF), into the exhaust system. This process is crucial for reducing harmful nitrogen oxide (NOx) emissions. It is located within the exhaust aftertreatment system. Weighing 0.246 kg, this injector ensures accurate dosing. Genuine OEM injectors provide precise spray patterns and flow rates, critical for effective emissions reduction and preventing system malfunctions.