In the field of automotive maintenance and manufacturing, industrial endoscopes are widely used for visual inspection of engine interiors to avoid increased costs caused by engine disassembly; By using industrial endoscopes, it is possible to efficiently and intuitively detect faults such as carbon deposits, wear, abnormal noises, and corrosion in internal components of the engine. In the engine manufacturing stage, industrial endoscopes have also become one of the conventional quality control methods. The inspection convenience brought by industrial video endoscopes with flexible probes in terms of fuel injectors, cylinder heads, and turbochargers is very evident. In the cleaning and maintenance of automotive engines, industrial endoscopes are also essential daily tools. They have the advantages of simple operation, flexibility, compactness, portability, and flexibility.