In recent years,China's market economic development trend is good,the popularity of the family car is getting higher and higher,the car has gradually become one of the main means of transportation for people to travel at present,providing support for the development of China's automobile industry.The engine is a very important component of the car,which can provide continuous power for the driving of the car.As far as the o-verall driving situation of the car is concerned,the engine is susceptible to many factors during operation.If the engine fails,it will have an adverse impact on the performance of the car and cannot ensure the safety of the car.Based on this,this paper mainly focuses on the analysis and discussion of automotive engine fault diagnosis and maintenance,in order to provide reference for relevant personnel.