Why is my Ford S-Max's engine making a knocking noise?

I have noticed that when I start my Ford S-Max, the engine makes a knocking noise. I'm not sure if this is something serious that I should be concerned about or if it's just a normal part of the car's functioning. Can anyone provide some insight on this issue?

It's possible that the knocking noise is coming from a loose or damaged belt in the engine. You should have it checked by a mechanic to determine the exact cause.

I had the same problem with my Ford S-Max and it turned out to be an issue with the spark plugs. It's best to get it checked out as soon as possible to prevent any further damage to the engine.