- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- FAE "77137" - Not available
VW - Golf, Passat, Transporter, Vento, Polo; SEAT - Toledo, Ibiza; CITROËN - ZX, Xsara; ALFA ROMEO - 155, 164