- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- NTK "1639" - Not available
SAAB - 900, 9000, 9-3; AUDI - 100, 80; FIAT - Tempra, Fiorino; ALFA ROMEO - 33, 164; CHEVROLET - Corvette, Astro; BMW - 3, 6