Why is my Audi A4's engine making a weird noise?

I have noticed that my Audi A4's engine is making a strange noise when I start it up. It goes away after a minute or so, but it's still concerning. What could be causing this issue?

It's likely that there is a problem with the engine's combustion process. If the noise goes away after a minute or so, it could be a sign of a clogged fuel filter or dirty fuel injectors. I recommend taking your car to a mechanic for a thorough inspection.

There could be an issue with the timing belt, which helps control the engine's timing. If this belt is worn or damaged, it can cause strange noises in the engine. I suggest taking your car to a dealership for a replacement if needed.

If the noise only occurs when you start the engine, it could be a sign of a worn out starter. This component is responsible for starting the engine, and when it's on its way out, it can make grinding or whirring noises. I recommend replacing the starter as soon as possible.