This workshop service manual provides comprehensive information for the Ford Sierra RS, specifically the RS Cosworth variant, covering production years 1985 through 1987. Engineered as a performance homologation special, the Sierra RS Cosworth is renowned for its potent YBT 2.0L DOHC Cosworth engine, aggressive aerodynamic styling, and enhanced chassis for superior handling. Its development was driven by motorsport aspirations, aiming for success in Group A touring car racing, distinguishing it from contemporary performance vehicles like the BMW M3 (E30) and Mercedes-Benz 190E 2.3-16 Cosworth.

This manual serves as an essential resource for owners, mechanics, and technicians, offering detailed guidance on maintenance, diagnostics, and repair. It covers all major systems, including the engine, transmission, suspension, brakes, electrical system, and bodywork. Within its extensive pages, you will find step-by-step procedures for routine maintenance, in-depth troubleshooting guides for common issues, and comprehensive instructions for component replacement and major overhauls. Technical specifications, fluid capacities, and special tool requirements are also provided to ensure accurate and efficient servicing of the Ford Sierra RS Cosworth.