What Is Lexia 3?
Lexia 3 is the dealer-level diagnostic system used for the PSA group – mainly Peugeot and Citroen, with versions also covering Renault. It connects a laptop to the vehicle’s diagnostic port through a dedicated interface and lets you do everything a franchised dealer can: read and clear fault codes, view live data, run component and actuator tests, and perform coding and configuration on the car’s modules.
It is the go-to tool for independent garages, PSA specialists and transporters because it gets deep into the modules that generic OBD scanners cannot touch – body control (BSI), ABS/ESP, airbags, gearbox, and the CAN network.
What Is Diagbox?
Diagbox is the newer, unified version of the same PSA software. Where older Lexia versions were separate packages for Peugeot, Citroen and Renault, Diagbox brings them together under one installer and one interface. It is the software that current Lexia 3 systems run, and it is what supports the later models and the diagnostic functions garages need day to day.
In practice, when people say “Lexia 3” or “Diagbox”, they usually mean the same system: the Actia LX3-style interface running the Diagbox/PSA software on a laptop.
Lexia 3 vs Diagbox – What’s the Difference?
- Lexia 3 is the hardware interface (and the classic software name). It supports Peugeot, Citroen and Renault.
- Diagbox is the modern software platform that replaced the separate Lexia packages. A current “Lexia 3 Diagbox” kit is the interface running the latest Diagbox software.
- Renault CAN Clip is a separate system for Renault vehicles (see below).
What Can a Lexia 3 / Diagbox System Do?
- Read and clear fault codes across all PSA control modules
- Live data monitoring for engine, transmission, ABS, airbags and body systems
- Actuator and component tests (injectors, valves, relays)
- Coding and configuration for replaced modules
- Working with the vehicle’s CAN network and BSI body computer
- Guide troubleshooting for professional technicians
Do I Need the Renault CAN Clip as Well?
CAN Clip is the dealer-level system for Renault, Dacia and Lada. It is a separate interface and software from LX3/Diagbox. If you mainly service Peugeot and Citroen, a Lexia 3 Diagbox system is the right choice. If you work on Renault vehicles too, you can either buy the Renault CAN Clip diagnostic tool separately or get a combined PSA + Renault package such as the Peugeot Citroen & Renault PSA and CAN Clip kit.
Laptop Requirements and Installation
Diagbox software runs on Windows laptops, and the installation process is the part people often find fiddly – which is exactly why we sell ready-configured laptops with the software installed and offer a remote installation service if you already own a laptop. With a pre-configured system you plug in, connect to the vehicle, and start diagnosing.
Which Lexia 3 System Should I Choose?
- Interface only – if you already have a suitable Windows laptop, buy the Lexia 3 Diagbox full kit and install the software (with our remote installation help if needed).
- Complete laptop system – if you want it working out of the box, choose a pre-configured Lexia 3 diagnostic laptop.
- PSA + Renault combined – if you cover the full French-market group, the PSA and CAN Clip combo covers Peugeot, Citroen and Renault with one setup.
Lexia 3 / Diagbox FAQ
Does it need an internet connection? No – the software runs offline on your laptop. No online account or yearly subscription is required for basic diagnostics, unlike some dealer systems.
Does it support my car? Vehicle coverage depends on the software version and the model year. Check the compatibility notes on the product page, or ask us with your exact vehicle and we’ll confirm.
Can it do coding and programming? Yes – that is the main reason professionals choose it over a generic scanner.
Is it legal to use? Yes. This is standard professional workshop equipment used by independent garages across the UK.
Need Help Deciding?
Tell us which Peugeot/Citroen/Renault models you work on and what you need to do, and we’ll recommend the right setup – contact our team. Every system includes clear compatibility notes and installation support.
