The Mazda 3, produced from 2003 to 2008, is a compact car renowned for its spirited driving dynamics, sporty handling, and stylish design. This first-generation model, built on the versatile Ford C1 platform, offered a choice of efficient inline 4-cylinder engines, including a 2.0L producing 148 horsepower and a more potent 2.3L generating 160 horsepower. Available with a 5-speed manual or a 4-speed automatic transmission, the Mazda 3 consistently earned accolades, including a spot on Car and Driver's 10Best list for 2005, and achieved excellent safety ratings with 5-star NHTSA front and side impact results. Its thoughtful engineering and commitment to driver engagement made it a standout in its segment, competing against established models like the Honda Civic and Toyota Corolla. This comprehensive service and repair manual provides in-depth guidance for maintaining and repairing the Mazda 3 (BK chassis) across its production years. It covers a vast array of systems, including detailed procedures for engine mechanical and electrical components, manual and automatic transmissions, drivetrain, brakes, suspension, steering, HVAC, and the electrical system. The manual offers step-by-step instructions for routine maintenance, component replacement, and even rebuilding procedures, supported by troubleshooting guides, diagnostic flowcharts, and essential wiring diagrams. With over 2000 pages of information, this English-language digital resource is designed to empower both DIY enthusiasts and professional technicians with the knowledge needed to ensure the optimal performance and longevity of their Mazda 3.