- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- FAE "77399" - Not available
VW - Golf, Polo, Jetta, Tiguan, Scirocco; SKODA - Fabia, Roomster; AUDI - Q3, A4; SEAT - Toledo