- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- Delphi "ES21325-12B1" - Not available
CHEVROLET - Lacetti, Spark, Nubira, Aveo, Kalos; BMW - 3, 5; AUDI - A4, A3; DAEWOO - Lacetti; ALFA ROMEO - 159, 156