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Focusing on the issues that automobile maintenance practitioners are concerned about, this book introduces in detail the structural composition of automobiles (including new energy vehicles), the basic working principles of main components, the use of maintenance tools, general maintenance methods, fault diagnosis and maintenance methods of mechanical and electronic control systems, etc. It focuses on the basic knowledge and maintenance methods of engines, transmission mechanisms and chassis, and briefly explains the basic knowledge and maintenance methods of air conditioning systems, lighting systems and starting systems. The book is divided into nine chapters, including automobile basics, common tools for automobile maintenance, engine, transmission system, braking system, steering system, suspension system, wheels and tires, and automobile electrical system. This book uses a large number of high-definition perspective views and exploded views to show the basic structure and working principles of the car. The diagnosis and maintenance part uses practical photos and diagrams, and adds necessary text explanations. It is easy to understand and has strong practical guidance value. It can be used as an introductory guide for junior car maintenance practitioners, and as a reference for teachers and students of relevant majors in colleges and universities.