What causes the Ford S-Max to have a high pitch noise while driving?

I have been noticing a high pitch noise coming from my Ford S-Max while driving on the highway. It seems to be coming from the engine area. What could be causing this and how can I fix it?

The high pitch noise could be due to a faulty or worn out serpentine belt. It is important to replace it as soon as possible to avoid further damage to the engine.

Another possible cause could be a failing bearing in one of the pulleys. It is recommended to have a mechanic inspect and replace any faulty parts to prevent further issues.

It could also be a sign of low transmission fluid. Make sure to check the fluid levels and top up if necessary.