Mercedes-Benz CLS C218 2011 Oxygen Sensor 0085424518 / 0258017287

This oxygen sensor is for Mercedes-Benz CLS C218 2011-2014 (including 3.5L V6 M274 and 3.0L diesel); can replace OEM part. Core function: monitor oxygen, feedback to ECU to adjust AFR, ensure combustion efficiency and lower emissions; prevent check engine light. OEM 0085424518 (Bosch 0258017287). Verify with vehicle part number for compatibility. Replacement difficulty medium; use dedicated socket, avoid thread damage; after install run diagnostics to clear codes and reset learning. This is a universal replacement with customization labeling suitable for bulk purchases for repair shops servicing CLS.