The Mazda 3, first generation (BK chassis), produced from 2003 to 2008, is a sporty and practical compact car available as a 4-door sedan or 5-door hatchback. Embodying a sporty driving philosophy, it offers engaging driving dynamics and a driver-focused cockpit. Available with either a 1.6L engine producing 104 hp or a more powerful 2.0L engine delivering 148 hp, and paired with a 5-speed manual or optional 4-speed automatic transmission, the Mazda 3 was designed for younger buyers and families seeking stylish and reliable transportation. It garnered significant recognition, including Car of the Year for 2004, and consistently achieved strong safety ratings. This comprehensive service manual provides detailed information for the maintenance and repair of the Mazda 3 BK generation. It covers a wide range of systems, including engine mechanical and electrical components, manual and automatic transmissions, suspension, steering, brakes, and electrical chassis systems. The manual also details body and interior work, safety restraint systems, and offers in-depth diagnostics and troubleshooting guidance. Owners, mechanics, and technicians will find essential information on routine maintenance procedures, major repair processes, component replacement, diagnostic codes, wiring diagrams, and precise technical specifications, ensuring the longevity and optimal performance of the vehicle.