The 2015 FLSTFB Fat Boy Lo is an iconic cruiser motorcycle, part of the renowned Softail platform. Combining classic styling with modern engineering, this model offers a distinctive riding experience, characterized by its powerful Air-cooled, Twin Cam 103B engine delivering robust torque. The Fat Boy line, with its heritage dating back to 1990, is celebrated for its bold presence and comfortable riding position, further enhanced by the 'Lo' designation signifying a lower seat height. This motorcycle is engineered for riders who appreciate timeless design and the legendary performance associated with the brand. This comprehensive workshop service repair manual provides complete factory-level repair and maintenance information for the 2015 FLSTFB Fat Boy Lo. It covers all major systems, including the engine, fuel system, transmission, brakes, suspension, and electrical components, offering detailed step-by-step instructions, hundreds of illustrations, and critical safety notes. The manual is designed to assist owners, professional mechanics, and technicians in performing scheduled maintenance, diagnostics, troubleshooting, and repairs, ensuring the longevity and optimal performance of the motorcycle. Its digital format allows for easy access and printing of specific sections as needed.