BMW Oxygen Sensor 11787547313 Exhaust System Original Quality, Fits 11787537995

BMW N-series engine oxygen sensor, OEM 11787547313, directly replaces 11787537995; fits 3 Series, 5 Series, X3. Sensor installed in exhaust; monitors oxygen and feeds ECU to adjust AF ratio; improves fuel economy and performance. If check engine light on, idle unstable, or fuel consumption rises, sensor aging; replace promptly.