This Service & Repair Manual covers Mercury 40 EFI, 50 EFI, and 60 EFI outboard engines manufactured from 2002 onward, identified by serial numbers starting with 0T409000. These four-stroke EFI engines are engineered for reliable performance, offering power outputs of 40, 50, or 60 horsepower depending on the specific model. The manual provides essential information for understanding the intricacies of these water-cooled engines, including their Electronic Fuel Injection systems and CDI ignition. This comprehensive English-language manual is designed to assist owners, mechanics, and technicians in maintaining and repairing their Mercury outboard engines. It details critical procedures and specifications across numerous chapters, including Electrical, Electronic Fuel Injection, Powerhead, Mid-Section, Lower Unit, and Attachments/Control Linkage. With original certified content, this manual serves as an authoritative resource for all service and repair needs, ensuring the longevity and optimal performance of your Mercury EFI outboard.