Why does my Audi A4 have trouble starting?

I've noticed that my Audi A4 has been struggling to start lately, even though I just got the battery replaced. What could be causing this issue?

It is likely that there is an issue with your starter motor or the related components, causing difficulty in starting your car. I recommend bringing it to a trusted mechanic for further diagnosis and potential repairs.

Another possible explanation could be a problem with your ignition switch or the spark plugs. I suggest getting these checked and replaced if necessary.

If your A4 is a diesel model, it could also be due to a clogged fuel filter. This can cause difficulty in starting and should be replaced regularly according to the manufacturer's recommendations.