A computer scan is a diagnostic procedure that uses a scanner to read and diagnose the computer systems in a car. It is used to detect and diagnose issues with the car‘s engine, transmission, brakes, and other parts of the car. During a computer scan, the scanner is connected to the car‘s computer system and can read and interpret codes that are generated by the car‘s computer. This information can then be used to identify and diagnose any issues that may be present in the car‘s systems. The computer scan can also be used to check for electrical problems, as well as any malfunctions in the car‘s sensors or other components.