- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- Hart "529 436" - Not available
VW - Golf, Bora, New Beetle, Polo, Passat; SEAT - Leon, Ibiza; AUDI - A4, A6; SKODA - Octavia, Fabia; CHEVROLET - Matiz, Spark