Car Star OBD box is "on-board diagnostic system", it is a car's own diagnosis of their own tools. Specialized diagnostic tools can be used to read the fault codes that exist in the car, the time when the fault occurs, mileage, the number of times the fault occurs, and other important parameters, which makes it easy for them to quickly understand the problem, to be more accurate than the dashboard fault lights and reliable, and thus can also be faster to solve the problem.