- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- FAE "77400" - Not available
AUDI - A6, A4, Allroad, A8, TT; SKODA - Superb; VW - Passat; MERCEDES-BENZ - E-Class, S-Class; ALFA ROMEO - 156, 166