Mercedes-Benz W220 R170 Oxygen Sensor A0015406017 | 0258006276 OEM Replacement

Your Mercedes-Benz W220 or R170 may show check engine light, unstable idle, weak acceleration, or high fuel consumption; typical symptom of aging oxygen sensor. This part monitors exhaust oxygen content and feeds ECU to control air-fuel ratio for efficient combustion and reduced emissions. Original replacement; OEM number A0015406017 (corresponding to 0258006276); fits Mercedes W220 S-Class and R170 SLK models. Install on cold engine; avoid burns; use dedicated socket to remove old sensor and apply anti-seize to prevent thread seizing.