Low of oil or low oil pressure. If the engine is not low of oil then the oil sending unit may be bad or the oil filter may be clogged. The oil pump may also be weak.
Low coolant level.
Coolant level low or level sensor malfunction.Coolant level low or level sensor malfunction.
It is possible that a check engine light on a Toyota Highlander will come on if the coolant level is low. Usually, though, there is another light that will come on that says 'low coolant' on some older Toyota's.
That light is for low oil pressure, not low level.
The light will come on when it is 1.5 quarts low in a hard turn or going up a hill. It will come on when it is 2 quarts low traveling normally. Why not just check the oil level regularly and not depend on a light telling you it is low?
why does oil light come on Oil level is low, pressure is low do to plugged filter or worn engine, or sensor is bad.
Check to see if the brake fluid level in your brake master cylinder ( in your engine compartment ) is low , if the brake fluid level is low or your parking brake is on the brake light in your gauge cluster will come on
The antifreeze is low in the reservoir.
Oil light senses oil pressure not oil level
Check the brake fluid level in the reservoir there is a sensor there that will make the light come on if your level is low.
because your coolant level is too low. put some antifreeze in it......
You probably have a low refrigerant level.