- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- Delphi "ES21272-12B1" - Not available
VW - Golf, Passat, Arteon, Polo, T-ROC; AUDI - A3, TT; SKODA - Octavia, Superb; SEAT - Leon, Ateca; CUPRA - Formentor