- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- Delphi "ES21189-12B1" - Not available
KIA - Ceed, Soul, Cerato, PRO Ceed, RIO, Venga, Carens; HYUNDAI - Accent, Elantra, I30, IX20, I20, Veloster, Creta