- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- Delphi "ES21690-12B1" - Not available
VW - Golf, Arteon, Tiguan, Passat; AUDI - A3, Q3; SKODA - Octavia, Superb; CUPRA - Formentor, Leon; SEAT - Leon, Tarraco