Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture BOSCH "0 258 027 00F" - Not availableAUDI - A4, A5, Q5, A6, A8; BMW - 3, 4; VW - Beetle, Passat B9; PORSCHE - Macan