- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- VEGAZ "ULS-167" - Not available
ALFA ROMEO - 156, Spider, GTV, 147, GT; VOLVO - S60, V60; AUDI - A4, A6; CITROËN - C5, C4