The problem, lovingly referred to as the intermittent vanishing odometer, is common with F-150's and Expeditions.
It is caused by a loose connection due to a cold solder joint on the ribbon cable receptacle that connects the odometer display to the instrument cluster.
The Ford dealer will probably insist on replacing parts, but the problem can be fixed by simply resoldering the bad connection. That takes some soldering skill and only after removing the instrument cluster and gaining access to the back of the instrument cluster where the connector is located.
A detailed repair manual describing the problem, including step-by-step instructions, with color photographs of the entire repair process can be obtained at http://www.odometer-repair.com. It covers every detail of removing the instrument cluster, identifying and removing the defective circuit board and repairing the defective solder joints.
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Check your fuses.
You cannot reset the odometer in your car, however you can reset your trip odometer.
Check fuses and light bulbs
If the speedometer works but the odometer does not, the odometer has failed.
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check the fuses The curtesy fuse is probably blown
The 2003 Ford Expedition is one of many Ford vehicles that are prone to problems with the digital odometer display. Symptoms of the common intermittent odometer problem include a dim or completely blank display. There is a complete discussion of the intermittent odometer problem at http://www.odometer-repair.com .
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The odometer is broken and needs replaced.
My speedometer works and the odometer does not because there is a plastic gear in the odometer that is broken.