Version: 2.1.0
Last Updated: April 22, 2026
File Size: 8.3 MB
Compatibility: Windows 10 / 11, Windows Server 2019+
While the software is typically packaged with the hardware drivers when you buy a Lexia 3 unit, you may need a standalone version if you lost the CD or need to reinstall.
File Name: PSA Interface Checker v1.xx (Versions vary, usually around v1.3 to v1.6)
File Size: Typically small, under 5MB.
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 specialized utility used to identify the hardware version and serial number of a PSA vehicle communication interface (VCI), such as the Lexia 3 or XS Evolution. This tool is crucial for verifying if your interface is "Full Chip" or if it requires a firmware update to work with newer versions of 🛠️ Step 1: Download the Tool
Since this is a legacy utility often shared within the diagnostic community, you can find it through the following sources: Community Hosted : A version is available via this PSA Interface Checker Install (Google Drive) Diagbox Packages : It is frequently included in the
folders of Diagbox installation packages, such as those found on French Car Forum 💻 Step 2: Installation and Setup Extract Files : If downloaded as a ZIP, use a tool like to extract the files to a known location, such as C:\PSA_Checker Connect Hardware
: Plug your Lexia 3/PSA interface into your PC's USB port. You do need to connect it to the vehicle for this check. Driver Check
: Ensure your drivers are installed. For older versions, Windows may prompt you to install "unsigned" drivers; select "Install this driver software anyway" 🔍 Step 3: Running the Checker : Open the executable (usually named PSA_Interface_Checker.exe : Click on the "ACTIVATE" button within the software interface. : Look for the "Version of the interface"
: Usually indicates an older or "lite" version that may struggle with newer Diagbox updates.
: Generally indicates a newer "Full Chip" interface compatible with modern Diagbox versions. ⚠️ Important Considerations OS Compatibility : This tool runs best on Windows 7 (32-bit) Windows XP
, which are the native environments for older PSA diagnostic tools.
: Because these tools are often sourced from third-party community links, always scan the downloaded files for malware before execution. for your interface version? PSA interface checker - French Car Forum
A: No – the protocol layer is specific to PSA’s K-Line and CAN addressing.