- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- FIAT - Panda, Punto, Doblo, 500, Grande Punto; LANCIA - Musa, Ypsilon; ALFA ROMEO - Mito; CITROËN - Nemo; PEUGEOT - Bipper