My tire gauge light stays on, how can I get that to turn off?

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The tire gauge light on my dashboard stays lit, even though my tires are not low. Every time I get an oil change at the dealership, they tell me it will automatically turn off after I have driven 6 miles (they reset it). However, I have now had my car for four years, the light turned on 6 months after purchase and has yet to shut off.