奔驰氮氧传感器 A0009052800 5WK96678 NOx废气监控系统

This NOx sensor (models A0009052800 / 5WK96678) is designed for 2010–2016 Mercedes-Benz W204, W212, W166 with 2.1L and 3.0L diesel engines (OM642, OM651). It monitors NOx concentration in exhaust and feeds signal to the ECU to optimize AdBlue dosing, ensuring emissions compliance and improved fuel economy. OEM numbers A0009052800 and 5WK96678 match exactly; convenient cross-check with OE systems. Replacement difficulty moderate; requires removing exhaust pipe section and careful connector handling; use a special tool to avoid thread damage. As a KLP replacement, performance matches OE but cost is about 40% lower, suitable for bulk fleet maintenance or after-sales repair.