how to determine which s series is my 1999 saturn sedan is?
Do an online search of your particular car a 99 Saturn and then see what comes up usually if you do a search online with one of the online car shops car stores that are selling cars like Autotrader they will give you a whole list of cars different models of Saturn's that have exactly what your car has in it with the actual nameplate SL LS etc that has yours options your car came with in it and you can kind of look and figure out what your car might be from their list good luck.
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