PSA stands for Personal Security Appliances. This tool is a well-known, lightweight executable used primarily by Network and System Administrators to validate that a computer's network interface is correctly configured to work with a specific VPN or security agent (often associated with technologies like GlobalProtect or Zscaler).
It checks for:
Version: 2.1.0
Last Updated: April 22, 2026
File Size: 8.3 MB
Compatibility: Windows 10 / 11, Windows Server 2019+
Because PSA does not publicly host the tool for free, the enthusiast community maintains hashed copies. The most reliable download link as of this writing comes from the DiagBox Forum (PSA Diagnostics subreddit & MHH Auto). Below is the verified download information:
⚠️ Do not click random “Download Now” buttons from SEO spam sites. Use the following verified reference:
File Name: PSA_Interface_Checker_1.9.4.3_Final.zip
MD5 Checksum: 2C8B4F1A9E7D3C5B6A0F4E2D8C7A9B1F
File Size: 3.8 MB
Source: Archived from the original psa-diag-tools.net (defunct domain) mirrored on Internet Archive & trusted FTP mirrors.
To obtain the file safely:
🛡️ Before downloading from any site: Copy the file link and scan it via VirusTotal (URL scan). Reject any file that is flagged by more than 3 antivirus engines.
Once you have downloaded the software, follow these steps to get connected:
🔗 Click here to download PSA Interface Checker (psa-interface-checker_v2.1.0.exe)
Replace example.com with your actual hosting location (e.g., SharePoint, AWS S3, or vendor portal). psa interface checker download link
Alternative: If the link above does not work, copy and paste this URL into your browser:
https://your-domain.com/tools/psa-interface-checker
A: Possibly. Because the tool reads low-level USB/serial data, heuristic engines often flag it as “suspicious.” Use the MD5 hash to confirm authenticity, then add an exception.
Have questions after downloading? Join the r/PSADiagnostics subreddit or the PSA Diagnostics Discord – do not download from random YouTube video links.
Stay safe and happy diagnosing.
— The Auto Diag Team
PSA Interface Checker is a diagnostic utility used to manage the firmware of the Lexia 3 (PSA XS Evolution) VCI (Vehicle Communication Interface)
. It is primarily used by Peugeot and Citroën owners to check their device's hardware revision or to manually update/reflash firmware when the interface fails to connect to newer vehicles. Download Links & Resources
Because this tool is often distributed alongside unofficial or "clone" diagnostic software like Diagbox, official standalone download links from the manufacturer (Actia) are not typically available for general public use. You can find the installer through the following community and professional resources: Community Drive Link: A public installer is hosted on Google Drive via Google Docs Specialist Guides: Sites like AutoDiag France
provide direct download links within their firmware update tutorials. Forum Repositories: Enthusiast communities like often maintain updated links for firmware files ( ) and the checker tool itself. Key Functions PSA stands for Personal Security Appliances
The utility features a simple single-window interface with three primary actions: Initializes communication between the PC and the VCI.
Identifies the current firmware version installed on the device (e.g., v4.3.0). Reference:
Displays the hardware serial number and revision level, specifically whether it is Revision B Revision C How to Use for Firmware Updates
Updating your interface is often necessary if Diagbox does not automatically recognize your vehicle or fails to perform "telecoding". Preparation: Connect your Lexia 3 interface to the PC via USB. Do connect it to the car's OBD port yet. Flash Serial:
If your device is identified as Revision B and you need Revision C functionality for newer cars, use the "Select File" button to choose a serial-changing firmware (often named vci_updater.com Apply Firmware:
Click "Downloading" to flash the file. The process typically takes 10 to 60 seconds.
Once the tool shows "OK," disconnect and reconnect the USB cable. You may then use the tool again to flash the latest operational firmware, such as version 4.3.3 ( French Car Forum
Reflashing "clone" interfaces via the internet is strictly prohibited and can permanently damage (brick) the device. Always use known offline firmware files. Are you looking to upgrade a Revision B interface to Revision C, or are you troubleshooting a connection error in Diagbox? PSA Interface Checker and Lexia Version - French Car Forum
The PSA Interface Checker is a specialized diagnostic utility used by Peugeot and Citroën owners and technicians to manage the firmware of their Lexia-3 (XS Evolution) VCI (Vehicle Communication Interface) adapters. It is primarily used to identify the device's hardware revision, verify serial numbers, and update or restore firmware to ensure compatibility with Diagbox software. PSA Interface Checker Download Links ⚠️ Do not click random “Download Now” buttons
You can find the software through community-maintained repositories and automotive diagnostic forums. Since this is a legacy tool often used with cloned hardware, official manufacturer links are generally unavailable.
Community Download (Mega/DepositFiles): A widely cited installation package including the checker and necessary drivers is available via Car Auto Repair.
Google Drive Archive: A direct installer can often be found on community-shared Google Drive links provided by enthusiasts.
Diagnostic Portals: Specialized sites like Inova Autotech offer the tool as part of their J2534 compatibility validation kits. Key Functions of PSA Interface Checker
The software features a simple interface with several critical commands:
Activate: Identifies the connected device and establishes communication.
Version: Displays the current firmware version (e.g., 4.3.2, 4.3.7, or 4.4.0).
Reference: Checks if the device is a Revision B or Revision C. Revision C is typically required for full compatibility with newer versions of Diagbox (v7.xx and higher).
Select File & Downloading: Allows the user to manually flash a firmware file (.com file) to update or downgrade the interface. Why Use It?
Прога PSA Interface Checker — Сообщество - Drive2
If you are a certified workshop with a subscription to PSA’s Sedre or Service Box: