- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- Delphi "ES21641-12B1" - Not available
VW - Golf, Jetta, Touran, Caddy, EOS; SEAT - Ibiza, Cordoba; SKODA - Fabia, Roomster; AUDI - A4, A6