- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- BMW - 3, 5, 1, 6, 7; FORD - Focus; AUDI - A4, A3; CHEVROLET - Cruze; CITROËN - C5; ALFA ROMEO - 156; DACIA - Logan; ...