Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture BAPMIC "BF0426110211" - Not availableAUDI - A4, A5, Q5, A6, A8; VW - Beetle, Jetta; PORSCHE - Macan; BMW - 3, 4