malfunction indicator lamp on 2009 Toyota Corolla

I found malfunction indicator lamp"check" was on today.How should I do?

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2 answers
Check all your bulbs, one of them may be burned out. If you do replace one, make sure to use the exact same bulb type.
I had this problem yesterday for Toyota Prado 2005 model. Found that water from wiper glass bottle was less and gas cap was not fixed properly. Just tighten gas cap, check water levels and drive for the day. If it still doesnt go off then you will need to show the mechanic where they will hook it to the computer - John Fernandes (Kuwait)