: Identifies whether the hardware is a Revision B or Revision C unit. Revision C is generally required for compatibility with newer vehicles and the latest versions of Diagbox (v7.xx and above).
Click "Initialize" or "Read" to see your device details.
In the world of PSA Group (Peugeot, Citroën, DS, Opel, Vauxhall) diagnostics, ensuring the vehicle communication interface (VCI)—commonly known as the or XS Evolution —communicates flawlessly with the software is crucial. The PSA Interface Checker 440 (often referenced around 2021-era troubleshooting) is a specialized utility designed for this purpose. psa+interface+checker+440+2021
One of the primary reasons automotive enthusiasts use the PSA Interface Checker is to verify the hardware capabilities of third-party Lexia 3 clones purchased online. Feature / Detail Full Chip Interface Lite / Low-Cost Clone Displays as 921815 C/ May display as 921815 B/ or fake C Optocouplers Present (protects car & laptop circuits) Omitted or bridged with resistors Microcontroller High-quality Samsung/Fujitsu chip Downgraded or generic alternative Diagbox Evolution Works seamlessly with Diagbox V7, V8, and V9+ Frequently fails or freezes on newer cars
Using the correct firmware ensures that the VCI can communicate with the BSI (Built-in Systems Interface) of newer, multiplexed vehicles without causing communication errors. : Identifies whether the hardware is a Revision
Version 4.4.0 is a stable and highly regarded build within the diagnostic community, used by DIYers and professionals alike to verify that their interface is functioning, correctly recognized by the PC, and running the proper firmware version. Core Functions of PSA Interface Checker
Plug your VCI module into a USB port on your Windows PC. Do not connect it to the car's OBD port yet. Ensure the device drivers are fully loaded. In the world of PSA Group (Peugeot, Citroën,
Allows offline flashing of specific firmware binaries ( APPLI.com ) without internet access.
The VCI, often referred to as the Lexia 3 or Actia XS Evolution clone, sits between a technician's computer and the vehicle's OBD2 port. Without the proper firmware version calibrated by an interface checker, the vehicle’s diagnostic software will fail to establish communication with critical electronic control units (ECUs) like the BSI, ABS, or engine management modules. Why the 440 (2021) Version Matters
The PSA Interface Checker 440 is available through:
: It is often the only way to "un-brick" an interface that was accidentally updated by official software, which typically renders unauthorized clones useless. The 2021 Shift: Version 4.4.0