Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Gebe "9 7061 1" - Not availableBMW - 3 (E46, WB), X3, Z4, X5; MERCEDES-BENZ - C-Class, E-Class; AUDI - A3, TT