The Sienna, specifically the First Generation (XL10) models produced between 1998 and 2003, represents an entry into the minivan market, engineered for reliability and family-oriented functionality. This generation of the Sienna, manufactured in Georgetown, Kentucky, is recognized for its robust 3.0L V6 engine, available in both Front-Wheel Drive and All-Wheel Drive configurations, and a 4-speed automatic transaxle. Praised for its spacious interior, practical design, and strong safety ratings, including a 5-star NHTSA front impact rating, the Sienna quickly established itself as a dependable choice for transporting families. Its reputation for quality manufacturing, a hallmark of the brand, further solidifies its appeal as a durable and cost-effective vehicle. This comprehensive service repair manual provides in-depth coverage for all models and engines of the Sienna from 1998-2003. With over 3,000 pages of detailed information, it serves as an essential resource for do-it-yourself enthusiasts and professional mechanics alike. The manual meticulously details every aspect of vehicle maintenance, repair, rebuilding, refurbishment, and restoration. Key areas covered include engine overhaul, drivetrain servicing, brake procedures, suspension and alignment, electrical systems with wiring diagrams, climate control, and body work such as sunroof service. It also offers factory maintenance schedules, troubleshooting guides, diagnostic trouble codes, and extensive technical specifications, including torque values and fluid capacities, all presented with clear illustrations and photos to facilitate accurate work and ensure the longevity of your vehicle.