Windows 7, Windows 8, Windows 10, and Windows 11 (32-bit and 64-bit)
A will show a valid version number and allow you to re-flash it. If the checker reports UNKNOWN , your interface is likely a poor-quality clone that will not work with Diagbox 7.xx or higher. Troubleshooting & FAQ 1. The Interface Checker shows "UNKNOWN"?
The is a specialized utility designed to bridge this gap. It doesn't fix your car directly; instead, it "checks" and updates the communication interface (the VCI) so it can finally speak the same language as your laptop. How the Story Unfolds
Diagbox updates frequently. When the software updates, it often requires a corresponding firmware version inside the Lexia 3 interface to communicate with newer car ECUs. psa interface checker download link
For detailed, step-by-step instructions on updating your firmware, I can provide a link to the Motorcarsoft tutorial, which includes a helpful screenshot.
The is a utility developed by ACTIA to manage, update, and repair the firmware on the diagnostic interfaces used with DiagBox.
Because this is proprietary software often shared by the enthusiast community, most links are hosted on third-party cloud services: Windows 7, Windows 8, Windows 10, and Windows
: A very small executable that does not require a full DiagBox installation to run. Cons :
: You connect your Lexia interface to your PC via USB. Crucially, you don't even need to be at your car for this part.
When checking your interface, the output indicates the quality of your clone. Full Chip (Recommended) Lite / Cheap Clone 921815C Often faulty or blank Firmware Update Yes (Up to v4.3.7) No / Error Protocol Support Full (Supports UDS) Limited (No UDS) BSI Programming Risk of bricking BSI The Interface Checker shows "UNKNOWN"
Based on community tutorials, a typical process for using the PSA Interface Checker involves the following steps:
Should say Reference: 921815C and NOT UNKNOWN or ERROR .