This manual covers the 2003 Buick Century, a mid-size sedan known for its comfortable ride and practical design. Built on the versatile W-body platform, the Century was engineered to offer a balance of comfort and everyday usability, making it a popular choice for families and commuters. Powered by a 3.1L V6 engine producing 175 horsepower and paired with a 4-speed automatic transmission, it provided reliable performance for its intended market. The 2003 model continues the legacy of a nameplate recognized for its quiet interior and value-conscious appeal, competing with established models in its segment. This comprehensive English-language manual serves as both an owner's guide and a detailed service repair resource for all 2003 Buick Century models. It meticulously details essential maintenance procedures, from routine oil changes and fluid checks to component replacements like spark plugs. The manual also offers in-depth troubleshooting guidance, diagnostic information for common issues, and step-by-step repair instructions for the vehicle's powertrain, chassis, electrical, and body systems. This resource is designed to assist owners in understanding their vehicle's operation and to provide technicians with the technical specifications and procedures necessary for accurate maintenance and repair.