Technical diagnostics of a vehicle is a set of goals and tasks related to troubleshooting the vehicle's mechanisms and systems in order to eliminate them further. Diagnostics of the vehicle must be carried out by qualified specialists who have at their disposal modern diagnostic equipment. Only this method of diagnostics will allow determining the exact technical condition of mechanisms, systems, and units of the car. To carry out the work on the diagnosis of the car created special areas of diagnosis of the car. Each day the type and production of new car models are expanding. Intensive growth of vehicles will cause a further increase in costs for their maintenance and repair. At present, a number of radical measures are being taken to improve the efficiency of diagnostics, maintenance, and repair of vehicles: the aggregate and site method of work is being applied; maintenance stations are being created; diagnostics are being widely introduced. Diagnostics of the car engine. Diagnosti