Have to agree with Tomj76.....
some of these lights are stupid and for lazy ,stupid people .
example = do i really need a sensor to tell me the coolant is low?actually the sensor was malfunctioning. i disconnectted it. no more problem.
example = two days after i changed the oil and filter the " change oil soon " light pops up.
should i race out to get another oil change. heck no ! it,s a stupid light .
No they are not.....Do you need a coolant level sensor? Absolutely.....how many people actually check their coolant levels? How many EVEN KNOW HOW TO CHECK THEIR COOLANT LEVEL? With no level sensor, you could be driving the vehicle with a low coolant level that could cause you to overheat and create serious problems....
And yes there are stupid people out there.....THEY NEED AN OIL STICKER REMINDER OR AN IDIOT LIGHT TO TELL THEM THEY NEED AN OIL CHANGE!
And when you get an oil change, an intelligent person would ask the tech doing the job, to reset the oil change light, if they didn't know how to do it themselves....