Why does my Audi A4 engine make a rattling noise when accelerating?

I recently noticed that when I accelerate, my Audi A4's engine produces a rattling or knocking noise. It seems to only happen when I press on the gas pedal. Is there something wrong with my engine? Is this a common issue with Audi A4s?

It is possible that your engine is experiencing a misfire, which can result in a rattling noise when accelerating. I recommend getting your car checked by a professional mechanic to diagnose and fix the issue.

This is a common issue with Audi A4s, especially with older models. It could be caused by wear and tear on the engine or a loose component. I suggest bringing your car to an Audi dealership for a thorough inspection and possible repairs.

Have you recently switched to a lower grade gasoline? Using a lower grade fuel than recommended can cause engine knocking or pinging. Try using the recommended grade of fuel and see if the noise persists.