: Plug the Lexia 3 interface into your computer via USB (it does not need to be plugged into the car).
Many integrations use short-lived access tokens (e.g., 1-hour validity). If the PSA interface checker attempts a sync 61 minutes after the last token refresh, the token is invalid → error 440. psa+interface+checker+440+2021
| Feature | IC-420 (2015) | IC-430 (2018) | | |---------|---------------|---------------|-------------------| | CAN FD support | No | No | Yes | | SGW detection | No | Partial | Full (identifies gateway model) | | Waveform preview | None | ASCII graph | Real-time TFT oscilloscope | | Firmware update | RS-232 | USB-B | USB-C (5x faster) | | VAN (legacy) | Yes | Yes | Yes (legacy mode) | : Plug the Lexia 3 interface into your
: Original VCIs have specific markings (e.g., "921815C"), whereas many clones may require manual firmware management via the Interface Checker to remain functional with updated software. Basic Usage Steps | Feature | IC-420 (2015) | IC-430 (2018)
PSA Interface Checker is a specialized utility tool used by owners of Lexia 3, PP2000, and Diagbox diagnostic hardware for Peugeot and Citroën vehicles. This utility is essential for managing the firmware of the VCI (Vehicle Communication Interface). Review: PSA Interface Checker (Version 4.4.0)
Click and browse to your desired firmware file (usually found in the Diagbox installation folder under APPLI.com ).