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That's your overdrive button ( the top " gear " of your automatic transmission )

If the overdrive is switched off the O/D OFF light will be illuminated in your gauge cluster

Overdrive is the normally allowed position , it is used on the highway / freeway and allows the engine to run at a lower RPM ( Revolutions Per Minute ) when the vehicle speed is faster , it helps you get better gas mileage and the transmission will run cooler

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13y ago

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