- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- PEUGEOT - 307, 306, 206, 406, 407; CITROËN - C5, Xsara; SAAB - 9-5, 9-3; FIAT - Ducato, Ulysse; OPEL - Vectra C, Signum