This manual covers the Ford Sierra RS, including the RS Cosworth and RS500 variants, produced between 1985 and 1987. Engineered as a homologation special with a motorsport pedigree, the Sierra RS is renowned for its performance-focused design, featuring the potent 2.0L Cosworth YBD turbocharged engine. Its development for rallying and touring car championships, including the unique RS500 evolution assembled by Aston Martin, underscores its exceptional engineering and driving dynamics. This vehicle represents a significant chapter in Ford's performance history, offering a blend of raw power and precise handling.

This comprehensive Workshop Service Manual (WSM) provides detailed guidance for the maintenance, repair, and troubleshooting of the Ford Sierra RS. It covers all major systems, including the turbocharged Cosworth engine, Bosch LE2-Jetronic fuel injection, T5 manual transmission, suspension, brakes, steering, and electrical systems. With over 1000 pages of technical information, diagnostic procedures, and repair instructions, this manual is an essential resource for owners, mechanics, and technicians seeking to preserve the performance and integrity of their Sierra RS models.