Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture BOSCH "0 281 004 067" - Not availableBMW - 3, 5, 1, X3, 4; CITROËN - Jumper, C5; FIAT - Bravo, Doblo; AUDI - A6, R8