1.Reading and Clearing Fault Codes: When a vehicle's electronic control unit (ECU) detects a malfunction in a system, it generates fault codes. The car scanner diagnostic tool can read these codes and provide the meaning of the codes to help users or repair technicians quickly locate the problem. At the same time, it can also clear the resolved fault codes. 2.RealTime Data Viewing: The tester allows users to monitor data from various sensors and actuators of the vehicle in realtime, such as engine RPM, vehicle speed, fuel pressure, and so on. By reading the data streams from various vehicle systems in real time, the diagnostic tester can analyze the vehicle's performance status, such as engine operating parameters, emissions, etc., and provide technicians with vehicle maintenance recommendations to optimize vehicle performance. 3.Multifunctional: The car scanner diagnostic tool has the advantage of versatility. It can help to test car diagnostics, engine trouble clear, car data flow and oxygen sensor test. And it can read the battery voltage and vehicle information of the car. Greatly improve your car repair efficiency. 4.LCD Display: The car scanner diagnostic tool has an LCD display, which is very convenient for you to read the information and understand the condition of the car. And it also contains three colors of prompt lights, including green light means support protocol detection, yellow light means reading the vehicle has a fault and red light means that the product is normally powered on.