What Is The Function Of Camshaft Position Sensor And What Will Happened If Not Fixed

I purchased a used 1996 ford explorer and when I tried to get it inspected they told me I need to get the camshaft position sensor fixed in order for it to pass. What is this and if it is not fixed quickly what will happen to my car, also how much does a part cost and where can I get it fixed or find info on it in durham, NC?

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