This service repair manual covers Mercury Mariner 150/175/200 EFI outboard engines manufactured from 2002 onwards. These fuel-injected engines are designed for reliable performance, offering horsepower variants of 150, 175, and 200 HP. The engineering focuses on robust fuel system components, including fuel pumps and injection systems, alongside an oil injection system for optimal lubrication. These engines are water-cooled and feature advanced ignition, electrical charging, and starting systems, as well as power trim and control linkage mechanisms. This comprehensive manual provides essential information for maintaining and repairing your Mercury Mariner outboard. It details troubleshooting procedures, diagnostic support, and step-by-step repair instructions for various systems, including the gear housing, drive shaft, and emissions control. Coverage extends to preventative maintenance, general specifications, wiring diagrams, and color diagrams, making it an indispensable resource for professional technicians, mechanics, workshops, and DIY enthusiasts seeking to ensure the longevity and optimal performance of their engines.