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The sensor located closest to the firewall is the vehicle speed sensor, This sensor tells the ECM how fast the car is moving, that information is than relayed to the speedometer in your instrument cluster. The speed sensor on the front of the transmission is a Turbine Speed sensor. The ECM watches the relation of the Turbine speed sensor to the shifting perimeters to make sure the transmission isn't slipping.

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Q: Why do a 2001 Saturn s series have two speed senors in the transmission?
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