Why does my Audi A1 1.0 TDI make a knocking noise when starting up?

Every time I start my Audi A1 1.0 TDI, I hear a knocking noise coming from the engine. It goes away after a few seconds but I'm worried it's a sign of of a bigger issue. What could be causing this noise and should I be concerned?

The knocking noise you hear when starting up your Audi A1 could be caused by a few different things. It could be something as simple as a clogged fuel filter or low oil levels. However, it could also indicate a more serious issue with the engine. It's best to have a mechanic take a look and diagnose the problem to be sure.