Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture NAP "CPL54090" - Not availableBMW - 3 (E46, WB), 5 (E39, WB), Z3, 7 (E38, E65, E66), Z4; AUDI - A6, A4; FORD - Escort