BMW X5 Oxygen Sensor 11781739845 0258003561, reduce emission fault light on

BMW X5 series oxygen sensor, OEM number 11781739845 (corresponding to 0258003561) can be replaced. Installed in the exhaust pipe to monitor exhaust oxygen content in real time and feed data back to the engine control unit to precisely adjust the air-fuel ratio, ensuring efficient combustion. If the dashboard emissions fault light is on, fuel economy worsens, or power response is sluggish during acceleration, sensor aging is likely. Installation difficulty: medium; estimated labor time about 1 hour; take care to avoid damaging threads during removal.