Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture LUCAS "LEB5263" - Not availableAUDI - A4, TT, A3, A6, A8; VW - Golf, Bora; SKODA - Octavia, Fabia; SEAT - Leon, Ibiza