- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- FAE "77440" - Not available
VW - Golf, Jetta, Tiguan, Touran, Polo; AUDI - A3, A4; SKODA - Fabia, Rapid Spaceback; SEAT - Leon SC, Toledo