The Mazda 3, specifically the BK chassis produced from 2003 to 2008, represents Mazda's commitment to delivering a compact car that balances everyday practicality with a distinct driver-focused experience. Building on the brand's philosophy of Jinba Ittai, or 'horse and rider as one,' this model is renowned for its engaging driving dynamics, characterized by sharp handling and responsive steering. Available with either a 2.0L LF-DE or a more powerful 2.3L L3-VE engine, both DOHC inline-4 configurations, the Mazda 3 offers a stylish design and a well-appointed interior, appealing to individuals and families seeking a reliable and enjoyable compact vehicle. Its strong reputation for build quality and its numerous accolades further solidify its position as a standout in its segment. This comprehensive Workshop Service Repair Manual is designed to provide detailed information for the maintenance, diagnosis, and repair of the Mazda 3 (BK chassis). Covering a wide array of systems including the powertrain, chassis, and electrical components, this manual offers in-depth procedures for everything from routine scheduled maintenance, such as oil changes and filter replacements, to complex engine and transmission overhauls. It includes essential troubleshooting guides, diagnostic trouble codes, wiring diagrams, and technical specifications necessary for accurate repairs. This resource empowers owners, mechanics, and technicians with the knowledge required to ensure the optimal performance, safety, and longevity of their Mazda 3.