Volkswagen Nitrogen Oxide Sensor 059907807AA SNS453 Fits Multiple Models

Volkswagen nitrogen oxide sensor SNS453, OEM number 059907807AA, designed for diesel engines, installed beside the SCR catalyst in the exhaust pipe. It monitors the NOx concentration in exhaust in real time and feeds back to the ECU to precisely control urea injection, ensuring emissions compliance. Compatible with VW Touareg, Audi Q7, Porsche Cayenne and other models with 3.0TDI engines. Installation difficulty is medium; estimated labor time about 1.5 hours. Pay attention to harness routing and dust shield sealing. If the exhaust lamp is on, urea consumption is abnormal, acceleration is weak, or engine rev limiter engages, check the sensor.