Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Denso "DOX-2036" - Not availableAUDI - A4, A3, A6, A8, R8; VW - Passat, CC; BMW - 3, 5; SEAT - Exeo; SKODA - Superb