Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture NAP "CPL54089" - Not availableBMW - 3 (E46, WB), X5, 5, Z3, 7; MERCEDES-BENZ - S-Class, E-Class; AUDI - A6, A4