The O/D off light comes on in your gauge cluster if the overdrive for your transmission has been turned off. The switch that controls your overdrive (able/ disable) feature is on the end of your transmission gear selector lever (Park/reverse/ neutral etc) Just push the switch to allow overdrive or the next time the Explorer is shut off and then started, it normally allows the overdrive feature .
overdrive off
o/d off
The OD button means "Over Drive", off or on.
OverDrive Off
it means the overdrive is not on.
There is a problem with the Overdrive. Seek professional help.
Overdrive off
"Over Drive Off"
a malfuntion has been detected
On the shifter there should be a button that says something to the effect of "O/D off" push it.
have vehicle scanned to determine problem
Normally the overdrive is allowed so you will not see the light If you have shut off the overdrive the O/D OFF light will be lit up in your dash