Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture FAE "77205" - Not availableAUDI - A4, A2, A6, S6, A3; VW - Passat, Polo; SKODA - Superb, Fabia; SEAT - Ibiza, Cordoba