Mercedes-Benz 3.2L Multiple Engine Oxygen Sensor A0015400517 Precise Air-Fuel Ratio Monitoring

For Mercedes-Benz engines with 3.2L, oxygen sensor (A0015400517) directly replaces OEM 0015409517, 0015405017 and 0025400117; universal fit. It accurately monitors air-fuel ratio and sends exhaust oxygen signals to the ECU to optimize burning in M112 engines (common in E-, S-, and ML-Classes). Replacing resolves high fuel consumption, rough idle or weak acceleration. If power drops or exhaust smells, sensor aging is usually the cause; replacement restores factory performance.