Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture INTERMOTOR "65094" - Not availableAUDI - A4, TT, A6, A3, A8; BMW - 3, 5; VW - Phaeton; MERCEDES-BENZ - C-Class, CLK