Mercedes-Benz Front Oxygen Sensor A0035427318 0258007161, front oxygen sensor controls air-fuel ratio

Mercedes-Benz C-, E-, S-, and ML-class front oxygen sensor, OEM number A0035427318 (replacement 0258007161); installed before the pre-cat in the exhaust pipe. Real-time monitoring of exhaust oxygen content and feedback to the ECU to precisely control the air-fuel ratio and ensure optimal engine operation. Installation difficulty moderate; labor 0.5–1 hour; protect threads during removal. Effectively resolves rough idle, rising fuel consumption, and weak acceleration.