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What is the on-board diagnostic system in an Audi A3?

I recently bought an Audi A3 and I noticed there was a warning light on my dashboard. I've heard about the on-board diagnostic (OBD) system, but I'm not sure how it works in my car. Can anyone explain what it does and how it can help me?

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The on-board diagnostic system in an Audi A3 is a computer-based system that monitors your car's performance and detects any malfunctions or issues. It can help you identify problems early on and avoid costly repairs.

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