This manual covers the Mercury Mariner outboard motor, produced between 2002 and 2005. This first-generation model features a 4-stroke engine with electronic fuel injection (EFI) and a CDI ignition system, delivering 40 horsepower. Engineered for reliability and performance, the Mariner is designed to provide dependable power for a variety of marine applications. Its robust construction and efficient design ensure a quality boating experience. The purpose of this comprehensive Factory Service Repair Manual is to provide detailed information for the maintenance, repair, and troubleshooting of your Mercury Mariner outboard. It includes essential technical specifications, lubrication requirements, scheduled maintenance intervals, and diagnostic procedures. This guide is an indispensable resource for owners, technicians, and mechanics seeking to ensure the optimal performance and longevity of their vessel's propulsion system.