Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture XEVO "XLS1106" - Not availableBMW - 3, 5, 6, 1, 7; CHEVROLET - Spark, Matiz; AUDI - A4, A3; ALFA ROMEO - 159, Spider