The Mercedes-Benz C-Class, produced for the model years 2001 through 2007, represents a significant entry in the luxury compact car segment. Available in both Coupe and Saloon (Sedan) body styles, and internally designated with chassis codes W203 for the Saloon and CL203 for the Sportcoupe, this generation offered a blend of high build quality, a comfortable ride, and a premium interior. Distinguishing attributes included advanced safety features for its era and a range of efficient yet powerful engines, such as the 1.8L M271 Kompressor, the 2.6L/3.2L M112 V6, the later 2.5L/3.5L M272 V6, and various turbocharged diesel engines including the OM611 and OM646 variants. This model competed with established players like the BMW 3 Series and Audi A4, aiming to deliver a refined driving experience characteristic of the Mercedes-Benz legacy.

This comprehensive workshop service and repair manual is designed to guide owners, technicians, and mechanics through the intricacies of the Mercedes-Benz C-Class (W203/CL203). Covering an extensive range of topics, the manual details routine maintenance procedures, engine mechanical and management systems, transmission service for both manual and automatic gearboxes, drivetrain, suspension, steering, and brake systems. It also provides in-depth information on the electrical system, climate control, bodywork (interior and exterior), and infotainment systems. Troubleshooting guides, diagnostic procedures, and detailed technical specifications, including torque values and fluid requirements, are included to facilitate accurate repairs and ensure optimal vehicle performance and longevity.