Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Autoteam "M0263A2" - Not availableAUDI - A4, A3, A8, TT, A6; VW - Amarok, Beetle; PORSCHE - 911, Boxster; SEAT - Exeo