What does the OBDII scan tool primarily analyze?

The OBDII scan tool primarily analyzes the on-board diagnostics of the vehicle’s engine and systems. This tool connects to the vehicle's onboard computer system to retrieve information about the engine's performance and various subsystems, including emissions control systems.

When using the OBDII scan tool, mechanics and technicians can check for diagnostic trouble codes (DTCs) that indicate current or past issues with the vehicle's components. This includes assessing the status of the emissions system, engine performance, fuel system, and other related parameters. Therefore, the primary function of the OBDII scan tool is to provide insights into the operational status of the engine and its various systems, assisting in diagnosing problems and ensuring compliance with emissions regulations.