As usual, low beam headlights not working are always caused by bulbs burn out.

You need to open the cover of low beam headlights and then check inside headlights low beam bulbs working or not.

If not working, you only need to buy new low beam headlights replace burn ones.

If low beam headlights are good, you need to check wires and sockets because loose sockets and aging wires also will make low beam headlights not working.