Check Your Car’s Health Easily


Thanks to its connected tool and its 100% free mobile application, the CarDiag solution allows motorists to inspect and diagnose their cars easily, independently and in an unlimited way.


A secure and ultra accessible device



Easily connect your CarDiag device to your car, and access its state of health in a few seconds.



The CarDiag device is certified and guaranteed for 2 years.

Boîtier CarDiag
Car Makes


CarDiag is compatible with all makes of vehicles released from 2001.



No risk for vehicles and their manufacturer guarantees.

About our Mobile App

CarDiag App

A 100% free, intuitive and multi-brand application

Coupled with the CarDiag device, the mobile application, available free of charge on the Google Store and on the App Store, allows motorists to diagnose the breakdowns of their vehicle and indicates the origin of the possible breakdowns in simple and easy to understand terms.

It also allows electronic faults to be detected and the engine warning light to be turned off.

Mobile App CarDiag

Key Figures

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Compatible cars


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Breakdowns detected


User manual


  • Buy your CarDiag diagnostic device
  • Install the CarDiag mobile app (AndroidiPhone)
  • Plug the CarDiag device into your Car’s diagnostic Port (often hidden under the steering wheel)
  • Connect your Phone to your CarDiag device
    • On Android, go to : Settings > Bluetooth > Connect to Bluetooth signal CarDiag with the code 0000
    • On iPhone : the connection is done automatically. You can move to the next step.
  • Run the CarDiag App : launch a diagnosic to easily check your vehicle’s health (breakdowns, component wear, CO2 emissions, etc.).


Matthew C.


This app is seriously amazing if you got time to do the labour. I couldnt believe what i had stumbled into. This car diagnostics application is simply an amazing idea. Like opening pandoras book what next.

Colin D.

This app to me is my preferred one I do use some others for second opinions but this has got to be the easiest to use and it does what it says it does, that’s why I’ve given it 5 stars.​

Marko L.


Nice idea, useful for people who don’t much about cars, like myself :)​


Our Partners



Major player in personal and property insurance in France. MAIF defends another idea of the economy, offers an innovative range of products and services, and places people at the heart of its organization. The quality of its customer relationship has been recognized consecutively for 12 years.



Autorigin provides any used car buyer and/or seller with vehicle history reports. Autorigin history reports offer traceability that streamlines automotive transactions: more transparency and therefore trust between buyer and seller of used cars, less fraud and increased security for your used cars.



C2A Garantie specialist in mechanical breakdown guarantee, offers via the CERTINITY brand to insure vehicles against the risks of mechanical, electrical and electronic breakdown which can quickly become a real nightmare for our mobility and our wallet.

Graal Systems

Graal Systems

A french software company founded by experts from the world of data in order to solve problems of data processing via the next-generation data platform.


The engine light or MIL (Malfunction Indicator Lamp) is a light on the dashboard of cars which indicates that a malfunction has been detected in the engine or the emission control system.

The check engine light flashing

The engine should be stopped as soon as possible as there is a risk of engine damage. The computer will switch the engine to “degraded” mode, limiting the engine speed to 3000 rpm for a petrol engine and 2000 rpm for a diesel engine.

The check light appears and disappears

This occurs if the fault is not detected for the next three consecutive cycles (1 cycle = starting + running + engine shutdown).

Engine light on

The check engine light remains on until the detected fault has been removed from the engine control unit. An electronic diagnosis then makes it possible to consult the fault code and helps to establish a diagnosis with a view to possible repair. Then the fault code can be cleared with the diagnostic tool.

No, it is impossible to clear the maintenance indicators. This operation is specific depending on the manufacturers. Only specific tools allow you to do this.

No, Cardiag can only diagnose engine and transmission faults. In the case of an ABS, Airbag or ESP warning lights, only a manufacturer’s suitcase is capable of making a diagnostic.

Auto technicians and owners use an OBD scanner device to understand the data the system gathers. It can provide data about your car’s air temperature, coolant, crankshaft and camshaft, position, road speed, and throttle as well as engine RPM…

All vehicles manufactured or imported are OBD compatible :
– In the United States since 1996
– In Europe (Gasoline since 2001, Diesel since 2003, LPG since 2001)

All OBD bluetooth (BLE) scanner tools are compatible with the CarDiag app.

Yes, the Cardiag application will allow you to turn off the engine light on your dashboard.

Yes, the Cardiag application will allow you to read and erase the engine faults detected on your vehicle.

The OBD Port, is the location where you can plug in any OBD tool into the vehicle to pull vehicle information. It is also the primary location of tracking devices such as dongles as the port provides ongoing power to the device.

Diagnostic Trouble Codes or OBD2 Trouble Codes are codes that the car’s OBD system uses to notify you about an issue. … A vehicle stores the trouble code in it’s memory when it detects a component or system that’s not operating within acceptable limits. The code will help you to identify and fix the issue within the car.

The OBD port is usually located under the dashboard, beneath the steering wheel column this website allows you to find the OBD port in your car.

We do not recommend that you leave the scanner permanently connected to your car, as it may drain your battery.
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