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Why does my Audi A3's check engine light keep coming on?

I recently purchased a used Audi A3 and the check engine light keeps appearing. What could be causing this and how can I resolve it?

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The check engine light could be coming on due to a variety of reasons, such as a loose gas cap, faulty oxygen sensor, or a problem with the catalytic converter. I recommend taking the car to a trusted mechanic for a diagnostic check to pinpoint the exact issue.

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