Why does my Audi A4 produce a sputtering noise when starting the engine?

Every time I start my Audi A4, there is a noticeable sputtering sound coming from the engine. What could be causing this and is it something I should be concerned about?

It is likely that the sputtering noise is coming from a dirty fuel injector. This can happen over time due to buildup of dirt, debris, and carbon deposits. It may be a good idea to have a mechanic clean the fuel injectors to improve the overall performance of your engine.

Another possible cause of the sputtering noise could be worn spark plugs. As spark plugs age, they become less efficient and can cause uneven or delayed ignition, resulting in the sputtering noise. Consider getting your spark plugs replaced if they have not been changed in a while.