i have a 2003 bmw 330xi, and i had the same problem immediatley after i changed the tires to regular summers from the factory run-flats. it is likely you ahd the run-flats and now the pressure guage in the cpu is going haywire. to this day my tire pressure warning light goes on and off (sometimes stays on for weeks). you might want to take it into the dealer if you want to turn off the light.
even if you didn't get run-flats initially, the problem lies within the fact that you are not using factory tires.
no worries...
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