- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- KW "498 503" - Not available
VW - Golf, Passat, Caddy, Jetta, Polo; AUDI - A3, A1; SKODA - Superb, Octavia; SEAT - Leon, Ibiza