This workshop service repair manual covers the Mazda 121 (DA1 chassis) produced between 1988 and 1991. As Mazda's compact and affordable entry-level model, often marketed as a city car, this generation of the 121 was developed with a focus on value and reliability. It featured a naturally aspirated 1.3L inline-4 engine, typically producing between 60-70 horsepower, and came standard with a 5-speed manual transmission and front-wheel drive. Available in various body styles, including 3-door and 5-door hatchbacks, the Mazda 121 was known for its economical operation and driver engagement, reflecting Mazda's philosophy of the era. This comprehensive manual is designed to empower both do-it-yourself enthusiasts and experienced mechanics with the knowledge needed to maintain and repair the Mazda 121. It provides detailed, step-by-step instructions, hundreds of photos and illustrations, and diagnostic procedures for all major systems, including engine, transmission, chassis, and electrical components. Key areas covered include scheduled maintenance, fluid changes, component disassembly and reassembly, troubleshooting guides for common issues, and electrical system diagnostics. The manual aims to be an inexpensive resource for keeping the vehicle in proper working order, offering factory-level information without shipping delays.