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What are the most common reasons for an Audi A3's check engine light to turn on?

I've noticed my check engine light turning on in my Audi A3. Just wondering what could be causing this and if I need to take any immediate action.

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One common reason for the Audi A3's check engine light to turn on is a faulty oxygen sensor. This can affect your car's fuel efficiency and overall performance. It's recommended to have it fixed as soon as possible.

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