I'd assume that the coolant hasn't been changed in a while. Take it to a garage or if you have the tools do it yourself. If you are not having cooling issues in hot weather, then just drain and replace the coolant included the plastic expansion tank. If there are any cooling issues or leaks, then take it to a garage and ask them to test. The radiator may be clogged inside preventing a free flow of coolant. They will either flush the system or replace the radiator.
Given that all the required oil changes and maintenance is done at the prescribed (or sooner) intervals and that it isn't driven like someone is in the Indy 500, it should last for a good number of years and conceivably several hundred thousand miles before the engine would need to be rebuilt. The same is true for any brand of automobile or truck. Proper maintenance is a key issue as is how one drives.
Without the year, make, and model, an exact answer can't be given here. However, in very basic, you will either need the code specific to your car, or you can run it up to your dealership. They can reset it in just a few minutes for a fee. From time to time, you can find the code directly in your owner's manual.
As long as you keep up with the maintenance, depending on manufacturer, it should last well over 200 thousand miles. I've seen Asian imports (Toyota's and Honda's mainly) with up to and including 500 thousand miles with the original engine and transmission. Regular maintenance includes and is not limited to, Fluid and Filter changes, Transmission flushes, Transmission pan gaskets(if leaking) and regular checkups.
Mine is an older model but I had same issue. The maintenance required light is on a sensor so it changes after a set number of miles. It's to remind you to take your car in for an oil change and things like that. It's factory set, typically; there's probably nothing wrong with your car if you've had an oil change in the past few thousand miles; if not, take it in, it can't hurt. To turn it off (this is based off of my model and I'm unsure if it would be the same for yours) there is a little hole looking thing in the dashboard glass cover/window[around your speedometer and the maintenance light.] Put the tip of the key into the hole and push a little; the light should reset.
Mainly preventative maintenance, oil changes every three thousand miles transmission and coolant flushes every thirty thousand miles. Tire rotaion every 7 thousand miles and rotate and balance every 14 thousand miles. Brake inspections every other oil change. and replacement of air filter every 15 thousand miles. waxing and heavy detail on your vehicle every six months and last but certainly not least checking your tire pressure and oil depth every time you get gas.
great cars, they had problems with connections to the sensors at the plugs, but they fixed that with a recall. The biggest service issue is the timing belt, has to be replaced every 60,000 miles. If you do regular maintenance cars run good and last a long time. My shop we are seeing them with 175 to 210 thousand miles running fine with regular maintenance.
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