- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- NTK "0209" - Not available
BMW - 3, 5, 7, 8, Z1; PORSCHE - 911; PEUGEOT - 405, 306; CITROËN - ZX, XM; FIAT - Punto, Tempra