- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- AUDI - A4, A6, A3, TT, A8; CITROËN - Xsara, C5; BMW - 3, 5; ALFA ROMEO - 156, Spider; FERRARI - 458, F430; ABARTH - 500, 595