PSA Interface Checker is a specialized utility tool used by owners of PSA (Peugeot/Citroën) diagnostic hardware, specifically the Lexia-3 (VCI) interface. It is not a diagnostic tool for reading car codes itself, but rather a "firmware manager" for the physical connector that links your laptop to the car. Review: PSA Interface Checker (4.4.0 / 2021 context) For enthusiasts and mechanics using
The 440 2021 checker is specifically tuned to PSA’s non-standard implementations. It will, for example, correctly identify that a 2021 Opel Grandland X requires a on the CAN bus — while a generic tester will fail silently. psa+interface+checker+440+2021
Plug your Lexia 3 interface into your PC via USB (no need to connect to the car yet). Run as Admin: Open the psa_checker.exe as an administrator. PSA Interface Checker is a specialized utility tool
Click to choose the appropriate firmware file (often APPLI.com ). "Select File" Click to choose the appropriate firmware