What is the onboard diagnostic system in the Audi A2 used for?

I recently bought a used Audi A2 and I'm wondering what the onboard diagnostic system is and how it can be used.

The onboard diagnostic system in the Audi A2 is used to monitor the performance of various systems in the car. It can also be used to detect and diagnose any potential issues or malfunctions. For example, it can detect an engine fault and provide the corresponding error code.

It's always a good idea to regularly check the onboard diagnostic system in your Audi A2. This can help you catch any problems early on and avoid more costly repairs down the road. You can also use it to monitor your fuel efficiency and detect any abnormal changes.