most check engine lights come on and stay on but, yours may have a warning flicker first--USUALLY it is just a pain the butt light that makes you bring it to the dealer,,,they are set at mileage intervals and when dealership or whomever replaces oil they RESET IT,,,but--if you want to try resetting it yourself (wont hurt anything-if it is something real will come on again after resetting it) Here is what you do... turn car off,,,press and hold TRIP reset if you have one and turn car to the position JUST BEFORE the start position and keep holding... you should see lights come on and then one by one go off OR your trip will have a series of dashes that decrease till there is none left... thats it ! if this does work and it is something wrong it will come back on,,,,in which case bring it to autozone or autostore and they will hook up the diagnostic and tell you for free what is bothering your car...good luck