The 2004 Volvo S40 is a compact executive sedan, built on the P1 platform shared with other manufacturers, and represents Volvo's commitment to safety and Scandinavian design. This model offers a blend of refined engineering and practical utility, making it a competitive choice in its segment. Available with a 2.0-liter inline 4-cylinder engine producing approximately 136 horsepower and 187 Nm of torque, and also offered with 2.4-liter naturally aspirated or 2.5-liter turbocharged engines, the S40 provides a balanced driving experience. Its dimensions, including a length of 4476 mm and a wheelbase of 2635 mm, contribute to a comfortable interior and stable handling. The vehicle also features robust safety systems, including standard Anti-lock Braking System (ABS) and optional traction control, along with comprehensive airbag coverage. This workshop service repair manual provides complete factory-level detail for the 2004 Volvo S40, covering all trim levels. It encompasses a wide array of systems, including engine mechanicals, fuel and exhaust systems, cooling, lubrication, ignition, and engine management. The manual details both manual and automatic transmissions, as well as chassis components such as suspension, steering, and braking systems. Extensive coverage is also given to electrical systems, bodywork, and interior components. Included are essential maintenance procedures, detailed repair instructions for disassembly and reassembly, troubleshooting guides, and diagnostic flowcharts. This comprehensive resource is designed to assist both do-it-yourself enthusiasts and professional mechanics in maintaining and repairing the vehicle effectively.