- Oxygen, Lambda Sensor
- Exhaust Oxygen Sensor (O2 Sensor)
- Measures oxygen in the exhaust so the ECU can correct the air-fuel mixture
- EFI "301404" - Not available
AUDI - A4, A2, A6, S6, A3; SKODA - Superb; VW - Passat; CITROËN - Berlingo, C3; CHRYSLER - Sebring, Neon