How do you reset the tire sensors?
Tire Sensors on 2005 BMW 525i
Read your manual for the car, to see what the recommended PSI is see if all the tires are inflated to spec, by filling up the tires to the specified spec and driving the vehicle for about 5 miles on the highway should reset the light if this doesn't work you may have to look into getting the sensors replace
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plug in the cigarette lighter