The 2004 Sienna, part of the second generation (XV20) model line, is a well-regarded minivan known for its reliability and family-friendly features. Built in Georgetown, Kentucky, this model offers a robust 3.3L DOHC V6 engine, delivering approximately 230 horsepower and 242 lb-ft of torque, paired with a 4-speed automatic transmission. Its spacious interior, combined with a strong reputation for quality and durability, made it a popular choice for transportation. The Sienna also received positive accolades, including Best Buy awards, underscoring its value and practicality in the minivan segment. This comprehensive service and repair manual provides detailed guidance for maintaining and repairing the 2004 Sienna. It covers all major vehicle systems, including engine mechanicals, engine management, transmission, drivetrain, suspension, steering, brakes, electrical systems, HVAC, and body components. The manual includes routine maintenance procedures, diagnostic steps, troubleshooting guides for common issues, and detailed repair instructions for component replacement and overhauls. Technical specifications, torque values, fluid capacities, and electrical wiring diagrams are also provided to ensure accurate and efficient service.