Determines if your interface is "Evolution" (full chip) or a "Lite" version.

PSA Interface Checker 4.4.0 (2021) is a specialized diagnostic utility used by Peugeot and Citroën (PSA Group) technicians and DIY enthusiasts. It is designed to verify the firmware version of Diagbox interfaces and ensure compatibility between the hardware (Lexia 3 / XS Evolution) and the software (Diagbox). 🛠️ What is PSA Interface Checker 4.4.0?

or later, the PSA Interface Checker is a mandatory part of your toolkit to ensure your VCI firmware (often version 4.3.7 or higher) is compatible with the software. It is a "set it and forget it" tool—once your interface is correctly flashed to Revision C, you likely won't need it again until you update your diagnostic software suite. Are you having trouble identifying your interface's current revision , or are you looking to upgrade to a specific firmware version

The PSA Interface Checker reveals several critical pieces of data about your VCI:

Replace engine ECU ($1,200) or reflash BSI (3 hours).

Click and point the browser to the vci_updater.com file.

: For modern vehicles (post-2015/2016), the hardware must typically be flashed to Revision C and use a firmware version compatible with the CAN-bus architecture of those cars.

Engage with developer forums or communities. These can be great resources for troubleshooting and learning how to get the most out of the tool.

Identifies various J2534-compatible interfaces, including Actia XS Evolution, Xhorse MVCI, and VAS 6154.