Wide Band 18mm Oxygen Sensor

Part Number 309-355 This heated wide-band O₂ sensor is specifically designed to work with all ThunderMax Performance EFI Modules featuring AutoTune. It provides accurate and reliable air/fuel monitoring which is essential for tuning in both stock and modified setups.  Key Features: ThunderMax replacement wide-band sensor, plug-and-play compatible with ThunderMax modules.  18 mm bung size: fits standard M18 × 1.5 threaded sensor ports common in many motorcycle exhaust systems.  Sold individually.  Ideal for precision tuning: helps your ECM’s AutoTune function accurately by providing a true wide-band signal instead of a narrow-band “rich/lean” switch. Compatibility & Install Notes: Designed for use with ThunderMax Performance EFI Modules with AutoTune.  Requires an 18 mm × 1.5 threaded sensor port in the exhaust header/collector. Ensure your exhaust system has this bung or use an 18 mm weld-in bung. Sensor must be installed in a location where it reaches normal operating tem