The Volvo S40 and V40 models from 2004 represent the final iteration of their first generation, a period marked by Volvo's commitment to safety and distinctive Scandinavian design. These compact executive vehicles offered a compelling blend of performance, particularly with their turbocharged inline-five cylinder engines, and practicality, especially in the V40 wagon form. Competing in a segment with established German luxury brands, Volvo differentiated itself through its renowned safety innovations like SIPS and WHIPS, a comfortable interior, and a robust build quality. The 2004 models, built in Belgium and Sweden, were a testament to Volvo's engineering prowess, providing a refined driving experience and a strong emphasis on occupant protection. This comprehensive Full Service Repair Manual is designed to be an indispensable resource for maintaining and repairing your 2004 Volvo S40 or V40. It covers an extensive range of topics, from routine and scheduled maintenance procedures, fluid specifications, and recommended service intervals to in-depth troubleshooting guides and detailed diagnostic steps for all major vehicle systems. The manual includes complete coverage of engine mechanicals, transmissions, suspension, steering, brakes, HVAC, and the entire electrical system, complete with detailed wiring diagrams. Its thoroughness extends to engine rebuilding, component testing, and addressing common issues, making it an essential tool for professional technicians and dedicated DIY enthusiasts alike.