You'll have to run diagnostics on it. An analyzer is connected to the car through a cable and it analyzes the computer and spits out codes that tell you why the light is on. Auto shops do this, or you can purchase a home diagnostic analyzer at an auto parts store.
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You may have a sensor malfunction. Have a mechanic run the codes and see if there are any stored in the computer. Just because the engine runs OK now does not mean it will continue to do so. The reason the light goes off after the vehicle has set over night may be due to the vehicle not sensing the issue after the long passage of time, until you begin driving again.
well yes if it is still safe to drive you may continue to drive it but you should get it looked at to see what codes your ecu (cars computer it puttting out ) you can do this for free at autozone they have a free code reading service takes only a few min and they can also print you out a slip telling you whats the reasons are the code is coming up aka check engine light on.
that all being said when the light comes on it means the cars ecu had detected a electronic signal from a sensor that was above or below a preset threshold e.g. you could have faulty o2 sensor it wont normally affect the drivabillity but you will burn more gas as your ecu dont know how to ajust the air and gas mixture therefore resulting in poor gas milage ect but all that being said you most likely just have a sensor that has failed most are easy to replace by yourself
hey hope it helps if so 4 thumbs up would be great have a great day
A vehicle check engine light can come on for a variety of reasons. Many times your vehicle will run perfectly fine even with a sensor that is bad. You still want to get these fixed due to the fact that it can cause lower gas mileage or in time cause problems with your vehicle. If you go to Auto zone they can plug a computer into your car for free and tell you what is bad. Once those problems are fixed the same place can check your vehicle again and clear the check engine light.
check the gas cap...i"ve found that a loose cap will set off the check light...if you dont have a computer to recall or reset the codes i believe it"ll just go away after you drive it for a couple days on its on once corrected.
im assuming the check engine light??????????? take it to autozone and tell them u gotta check engine light on and u need to know why. if its not the check engine light then i dont know cause u didnt specify