Turn off the maintenance indicator light

Please remove the battery connectors for 5 minutes and replace.

That should do the trick.

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Here is a great site that has all the oil light reset procedures for Kia and every other make and model. Hope this helps: Reset Engine Oil Service Due Message After Kia Oil Change

The maintenance light is different from the check eng.
light, it's programed to come on at manuf. recomended service intervals.
if you just want the light out you can clear it with an
OBDII tool if you don't have access to one you can
always take it in for an oil change if it's been a while
and they will clear it for you.
hope this helps any other ? gimme a shout.
good luck