Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture ERA "570480A" - Not availableBMW - 3 (E91, E92), 5 (E39, WB), 1 (E81, E87), 6, 7 (E65, E66, E67), Z4, X1, X3