Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture NTY "ESL-BM-011" - Not availableBMW - 5, 3, 6, Z4, 7 (F01, F02, F03); ALPINA - B7; AUDI - A4, TT