It will go off if the issues that caused it to come on have gone away after a few driving cycles. I would try to clear it by pressing the button next to the LED if it has one. Somewhere on here there are directions for how to read it. Not sure if this is applicable to your model though. If not, just disconnect the negative lead on the battery for a minutes or so and if whatever set it off has cleared itself up the CE light should stay off. If it comes back you have an issue that you need to "read the code" to find out what is causing it to come on. Everytime mine has ever come on it either needed the egr line "rodded out" to the intake manifold or it needed a new O2 sensor.

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Jim