Oxygen, Lambda Sensor Exhaust Oxygen Sensor (O2 Sensor) Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture Kawe "8845 28014" - Not availableCITROËN - ZX, Xsara, AX, XM, Xantia; PEUGEOT - 405, 406; FIAT - Punto, Panda