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Why does my Audi A4 constantly display a 'Check Engine' light?

I have noticed that my Audi A4's 'Check Engine' light keeps turning on even though my car is running smoothly. What could be causing this issue and how can I fix it?

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As an automotive technician, I have seen this issue in Audi A4s quite often. It is usually caused by a faulty oxygen sensor. I recommend getting it replaced as soon as possible to avoid any potential engine damage.

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