The RLX02078/B Oxygen Sensor, FAE is a genuine Royal Enfield replacement sensor designed for compatible motorcycles powered by the J-Series 350cc engine platform.
The oxygen sensor, commonly known as an O2 or Lambda Sensor, is fitted to the exhaust system and measures the oxygen content in the exhaust gases. This information is supplied to the motorcycle’s ECU, which uses it as part of the engine’s fuel-management and emission-control strategy.
A faulty oxygen sensor may contribute to issues such as an engine warning light, incorrect fueling, poor running, or emission-related fault codes. RLX02078/B is suitable for replacing the corresponding original sensor where this part number is specified.
Royal Enfield Part Number: RLX02078/B
Catalogue Description: OXYGEN SENSOR, FAE
Key Features
- Genuine Royal Enfield replacement component
- Part Number: RLX02078/B
- Catalogue Description: OXYGEN SENSOR, FAE
- Also known as O2 Sensor / Lambda Sensor
- Designed for compatible J-Series 350cc motorcycles
- Monitors oxygen content in exhaust gases
- Provides exhaust feedback to the ECU
- Important component of the fuel-management and emission-control system
- Direct replacement for the corresponding original sensor
Compatibility
Compatible with applicable Royal Enfield J-Series 350cc models, including:
- Royal Enfield Classic 350 Reborn
- Royal Enfield New Bullet 350 J-Series
- Royal Enfield Meteor 350
- Royal Enfield Hunter 350
Important: Compatibility can vary according to model year, ECU/exhaust specification, and emission configuration. Please verify RLX02078/B against the existing sensor or vehicle parts catalogue before ordering.
Application
J-Series Classic 350 Reborn, New Bullet 350, Meteor 350 & Hunter 350
Used in the motorcycle’s exhaust and engine-management system to monitor exhaust oxygen levels and provide feedback to the ECU for appropriate fuel and emission management.
Package Contents
- 1 × Royal Enfield RLX02078/B Oxygen Sensor, FAE
The exact kit configuration and any additional fittings should be checked against the supplied packaging.
Installation
Professional installation and diagnostic verification are recommended. Before replacing the oxygen sensor, related wiring, connector condition, exhaust leaks, and stored ECU fault codes should also be checked.









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