What is the belt that is on the left side of the engine? If looking down on it from above.
It looks like it is next to the timing belt.

When I start the car, that is squeeking a little bit.
Its a non turbo engine.

 

That is the serpentine belt.

 

And the belt drives power steering pump, alternator, A/C compressor & secondary air pump if so equipped.

If squealing, the tensioner may need lubrication/replacement (unless the belt is contaminated with coolant/oil or being glazed). I would also replace the belt with OEM Continental Tech. There are 2 different length belt and the longer version is recommended.


JPN

 

Try spraying some belt dressing on it as a temporary fix. Spray it CAREFULLY when it starts squeaking while the motor is idling.