Why does my Kia Ceed's engine make a knocking sound?

I recently noticed that my Kia Ceed's engine makes a knocking sound when I start the car or when I am driving at low speeds. What could be the cause of this issue and how can I fix it?

The knocking sound could be caused by low oil levels in your engine. Make sure to regularly check and top off your oil to prevent damage to your engine.

Another possible cause could be a faulty spark plug. Make sure to get them checked and replaced if needed to prevent any further issues.

If the knocking sound is accompanied by a loss of power, it could indicate a problem with the fuel pump. Have it inspected and replaced if necessary.