- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- Hart "529 437" - Not available
VW - Passat, Transporter, Golf, Tiguan, Multivan; AUDI - A4, A3; SEAT - Altea, Leon; SKODA - Superb, Octavia; PORSCHE - Cayenne