- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- NTK "0399" - Not available
AUDI - A3, A4, A6, TT, A8; SEAT - Leon, Toledo; VW - Bora, Jetta; SKODA - Octavia; CITROËN - C5, Xsara; ALFA ROMEO - 156, 166