Updated on 02/04/2026

How to diagnose a car without a license?

Licence-free cars (VSP) are increasingly present on the roads. Like any modern vehicle, they can encounter engine faults. On certain models, a diagnostic tool allows reading and clearing fault codes recorded by the engine.

Performing maintenance on your licence-free car
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Licence-free car diagnostics: reading and clearing engine fault codes

Licence-free cars have become a common mobility solution, particularly for young drivers, people living in rural areas, or those without a category B driving licence.

The engine is controlled by an ECU, capable of monitoring several vehicle parameters. When an anomaly is detected, the ECU records a fault code.

On certain models of licence-free cars, it is possible to read and clear these engine fault codes using a diagnostic tool like klavkarr, provided you check the vehicle's compatibility.

Licence-free car warning lights

Can you perform diagnostics on a licence-free car?

Unlike standard cars, not all licence-free cars have an accessible diagnostic system. This mainly depends on the model and year.

When the vehicle is compatible, a diagnostic tool allows reading the information recorded in the engine's ECU.

On compatible licence-free cars, diagnostics concern only the engine.

How to read fault codes on a licence-free car?

The procedure is quite simple.

  • Check the vehicle's compatibility
  • The first step is to check if your licence-free car is compatible with klavkarr.

    To do this, visit our website and provide the vehicle's make, model, and year.

  • Connect the diagnostic tool
  • Once compatibility is confirmed, locate the vehicle's diagnostic port, connect the klavkarr tool, and then launch the diagnostic application.

  • Read the fault codes
  • The application displays the fault codes recorded by the engine.

    Each code corresponds to a type of anomaly detected by the ECU. This helps you understand why a warning light has turned on.

  • Clear the engine fault codes
  • After identifying the problem and performing a repair, it will be possible to clear the engine fault codes.

    This operation turns off the engine warning light, checks if the fault reoccurs, and ensures the repair was effective.

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What are the benefits of diagnostics on a licence-free car?

Using a diagnostic tool offers several benefits for maintaining a licence-free car.

  • Prevent a more significant breakdown
  • An engine warning light can be the first sign of a mechanical issue. Diagnostics allow you to act quickly.

  • Understand the problem without immediately visiting a garage
  • By reading the fault codes, you can understand the potential cause of the fault and determine whether the issue is minor or more serious.

  • Save on repairs
  • In some cases, an engine warning light may be linked to a temporary fault.

    Engine diagnostics allow you to check if a repair is truly necessary and avoid unnecessary replacement of certain parts.

  • Save on repairs
  • Regular diagnostics also help monitor the engine's overall condition and anticipate certain issues. This is particularly useful if you perform the vehicle's maintenance yourself.

FAQ - Licence-free car diagnostics

Can you connect a diagnostic tool to a licence-free car?

Yes, but only on certain models. Some licence-free cars have an engine ECU capable of recording fault codes. With a compatible diagnostic tool, it is possible to read and clear these codes.

Where is the diagnostic port on a licence-free car?

The diagnostic port is generally located under the dashboard or near the engine ECU. Its location may vary depending on the vehicle's make and model.

Are all licence-free cars compatible with diagnostics?

No. Compatibility depends on the model, year, and engine. It is recommended to check the vehicle's compatibility before using a diagnostic tool.

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