This manual covers the Mercury Mariner 225 HP EFI outboard engine. Engineered for reliable performance, this water-cooled engine features Electronic Fuel Injection (EFI) for efficient power delivery. Its robust construction and advanced systems are designed to meet the demands of various marine applications, ensuring a dependable boating experience. This comprehensive Factory Service Repair Manual provides detailed information for the maintenance and repair of your Mercury Mariner 225 HP EFI. It includes essential procedures, technical specifications, troubleshooting guides, and safety recommendations. This resource is invaluable for owners, technicians, and mechanics seeking to maintain the optimal performance and longevity of the engine.