- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- EFI "301397" - Not available
VW - Golf, Polo, Caddy, Passat, EOS; SEAT - Ibiza, Cordoba; BMW - 3, 5; AUDI - A3, A4; SKODA - Fabia, Octavia