What kind of information can be retrieved using a scan tool?

A scan tool is primarily designed to interface with a vehicle's onboard diagnostic system, allowing technicians to access a wealth of information about the vehicle's performance and status. One of the most critical functions of a scan tool is to retrieve diagnostic trouble codes (DTCs), which are standardized codes that help identify issues within various vehicle systems. These codes are generated when the vehicle's computer detects a fault, and they guide technicians in diagnosing problems accurately.

In addition to DTCs, a scan tool provides real-time vehicle data, such as engine RPM, coolant temperature, and sensor readings. This information is invaluable for diagnosing issues, as it allows technicians to see how the vehicle behaves under various operating conditions, helping them pinpoint the root cause of a problem more effectively.

While visual inspection results, vehicle maintenance history, and engine size specifications are important aspects of vehicle service and repair, they are not directly retrieved using a scan tool. Therefore, the correct choice highlights the scan tool's essential role in diagnosing vehicle issues by providing both trouble codes and real-time data.