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There are two possibilities. One is that the Vehicle Speed Sensor (VSS) is not working or its connection/wiring are having a problem. However, if your car has an automatic transmission, bad VSS would be causing all kinds of other problems besides just the speedometer not working.
The other possibility is a faulty instrument panel, you would have to remove the dash and replace the panel.
For either one, refer to a manual for instructions on removal or installation, they are too detailed to include here. There are free online manuals for your car at www.autozone.com.
If all the connection and power supplies to instrument cluster are ok,I suspect that the speedometer or instrument cluster is faulty but before you replace it, make sure the gear inside the transmission that drives the VSS is in good.
A green flashing "S" is similar to a check engine light. It is telling you that something in or on your transmission is not functioning correctly, such as the speed sensor or shift control solenoids. If it starts flashing and the speedometer stops working or the transmission shifts weird, take it to a mechanic.
Remove the VSS again and reach into the hole the VSS goes into with your finger. You want to use your finger to ensure that the plastic gear (inside the transaxle) is not damaged or missing teeth. Also check the plastic gear on the VSS. If either of these gears have damaged teeth, your VSS won't turn, hence no speedometer or odometer function.