- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- NTK "1647" - Not available
AUDI - A4, A3, A6, TT, S6; MAZDA - Premacy, 323; BMW - 3, 1; ALFA ROMEO - 159, 156; BENTLEY - Continental