Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture REAL "8029474TOE" - Not availableBMW - 5, 7 (F01, F02, F03), 3, 1, 4; AUDI - A4, TT; ALFA ROMEO - 156, Spider