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What causes the 'check engine' light to turn on in an Audi 80?

I recently bought a used Audi 80 and the 'check engine' light keeps turning on. I've had it checked by a mechanic but they couldn't find anything wrong. What could be triggering the light to come on?

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The most common cause of a 'check engine' light in an Audi 80 is a faulty oxygen sensor. Try getting that replaced and see if it solves the issue.

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