Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Mobiletron "OS-H408P" - Not availableBMW - 3, 5, 6, 1, 4; AUDI - A4, A6; ACURA - Vigor, Legend; ALFA ROMEO - 159, 156