Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture FREY "880608501" - Not availableBMW - 5 (E39, F10, WB), 3, 7 (F01, F02, F03), X6, X1, 1, 6, X5, X3, Z4