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If all the gauges in the clustor are working and only the speedometer is not, I suspect the Vehicle Speed Sensor which is located in the transaxle. Easy to replace and only about $15.

http://www.partstrain.com/ShopByDepartment/Speed_Sensor/Cadillac/SEVILLE/1999

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Q: My 98 Cadillac Seville sls's speedometer keeps malfunctioning Can anyone tell me why?
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