The low tire pressure 'exclamation point' icon inside the cross-section of a tire should be yellow? Orange or red exclamation points inside a circle may be more urgent, like a brake fault?
With the recent Autumn weather temperature drop, tire pressures will also drop. It's common at this time of year. All 4 should drop fairly evenly. If any one tire is particularly lower than the other 3, that may be from a leak.
Check and adjust tire pressures according to the label inside the drivers door opening or inside the owners manual.