- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- Delphi "ES21090-15B1" - Not available
VW - Golf, Passat, Polo, Tiguan, Touran; AUDI - A3, A1; SEAT - Leon, Ibiza; SKODA - Superb, Octavia