- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- CITROËN - Xsara, Xantia, Saxo, ZX, XM; PEUGEOT - 106, 206; FIAT - Punto, Panda; FORD - Escort; BMW - 7, 5; LANCIA - Y, Delta