The Mazda3, a compact car produced by Mazda, represents the first generation (BK) of this popular model, with the 2008 model year featuring a mid-cycle refresh. Known for embodying Mazda's "Zoom-Zoom" philosophy, the Mazda3 offers engaging driving dynamics, responsive handling, and a refined interior, setting it apart in its segment. Available as both a 4-door sedan and a 5-door hatchback, it was offered with a 2.0-liter inline 4-cylinder engine and an optional, more powerful 2.3-liter MZR DISI Turbo engine, particularly in the performance-oriented MazdaSpeed3 variant. The vehicle's engineering quality is underscored by its strong safety ratings, including 5-star frontal and side crash test results from the NHTSA for the 2008 model year. This workshop service repair manual provides comprehensive guidance for the Mazda3 (BK) 2008 model. Its scope covers all essential areas for maintenance, diagnostics, and repair, including detailed procedures for engine mechanicals, engine management and emissions, manual and automatic transmissions, drivetrain, suspension, steering, brakes, and the electrical system. The manual also addresses body and chassis, HVAC, and safety systems, offering step-by-step instructions for maintenance tasks, systematic troubleshooting, and complete repair and overhaul procedures. Additionally, it includes crucial technical specifications, torque values, and detailed wiring diagrams, making it an indispensable resource for professional technicians and advanced DIY enthusiasts aiming to maintain and restore the vehicle's optimal performance and reliability.