This book systematically integrates comprehensive fault detection and diagnosis technologies for automotive engines, chassis, electrical systems, and emission systems. It establishes a complete educational framework covering fault verification, root cause analysis, diagnostic strategies, and troubleshooting procedures through a "theoretical analysis + real-world case studies + data-driven diagnostics" approach. Adopting an action-oriented methodology with authentic enterprise cases, the book incorporates new energy technology modules and aligns with 1+X certification standards. Supported by visual knowledge maps and virtual-real integrated training projects, it cultivates "automotive doctor" problem-solving mindsets while bridging industry competency requirements, making it ideal for modern apprenticeship programs and vocational education in automotive maintenance talent development.