This workshop service manual covers the Mercury Mariner 175 HP EFI 4-stroke outboard engine manufactured between 2002 and 2007. Designed for reliable performance, these 4-stroke engines feature Electronic Fuel Injection (EFI) for efficient power delivery and are water-cooled for optimal operating temperatures. The engine's robust construction and engineering quality ensure durability for various marine applications. This manual is specific to this generation of 175 HP EFI 4-stroke models, providing detailed information for their upkeep and repair. The purpose of this manual is to provide comprehensive guidance for the repair and overhaul of your Mercury Mariner outboard engine. It details essential maintenance procedures, including lubrication with recommended Mercury Premium 25W-40 Outboard Oil, and outlines service intervals typically based on operating hours or annually. Technical specifications, troubleshooting advice, and information on the electrical, fuel, and cooling systems are included to assist owners, mechanics, and technicians in maintaining the engine's peak performance and longevity.