: Checks if the interface is identified as Revision B or Revision C . Revision C is generally required for compatibility with newer versions of Diagbox (v7.02 and higher).

If your PSA server’s clock and the target API server’s clock differ by more than 5 minutes, time-based OAuth tokens will be rejected, triggering error 440. This became a major issue after daylight saving time changes in 2021.

: By 2021, many users transitioned to standalone versions of Diagbox (such as those provided by developers like Mr. Guyot) which required specific firmware versions (e.g., 4.3.7 or higher) to communicate with newer PSA vehicles. The "Checker" Utility

Connect the VCI to your PC via USB (do not connect to the car yet). Run PSA Interface Checker.exe . Click to initialize communication with the tool.