The Mazda Protege, specifically the 2004 model year under the BJ chassis designation, represents a compact sedan and hatchback known for its engaging handling dynamics and reliable performance. Building on Mazda's philosophy of Jinba Ittai, or "horse and rider as one," this vehicle offers a balanced driving experience that made it a competitive offering against rivals such as the Honda Civic and Toyota Corolla. Available with either a 1.8-liter or a 2.0-liter DOHC engine, and paired with either a 5-speed manual or a 4-speed automatic transmission, the Protege provided practical transportation with an emphasis on driver connection. Its engineering quality and value proposition contributed to its positive reception in global markets.

This comprehensive service and repair manual provides extensive guidance for the Mazda Protege (BJ Chassis) 2004. It covers a wide array of maintenance procedures, from routine oil changes and filter replacements to critical tasks like timing belt service and coolant flushes. Detailed information is also provided for major repairs, including engine and transmission overhauls, suspension component replacement, and brake system servicing. Furthermore, the manual offers in-depth diagnostic and troubleshooting guidance for various systems, including engine performance, drivetrain, electrical components, and HVAC, along with detailed wiring diagrams and component testing procedures. This resource is designed to empower owners, mechanics, and technicians in maintaining and repairing the vehicle effectively.