The Mazda 3 MPS, also known as the Mazdaspeed 3, is a high-performance variant of the second-generation Mazda 3, produced in 2012. This compact sport sedan and hatchback is engineered for enthusiasts, offering sharp handling, responsive steering, and a powerful turbocharged MZR DISI TURBO (LF-VDS) engine producing 263 horsepower and 280 lb-ft of torque. Its aggressive styling, complete with unique body enhancements and a standard helical limited-slip differential, distinguishes it from the mainstream Mazda 3, positioning it as a compelling choice against performance rivals. The model is built upon Mazda's legacy of creating driver-focused vehicles, delivering engaging driving dynamics and a potent powertrain in a practical package. This comprehensive factory service manual provides detailed information for the maintenance, repair, and diagnosis of the 2012 Mazda 3 MPS (BL chassis). It covers a wide range of systems, including the powertrain, transmission, chassis, and electrical components, along with bodywork. Within its extensive pages, owners and technicians will find essential procedures for routine maintenance, troubleshooting guides for common issues, in-depth repair instructions from engine overhauls to clutch replacements, and critical technical specifications such as torque values, fluid capacities, and wiring diagrams. The manual serves as an authoritative resource to ensure the optimal performance and longevity of the vehicle.