Got the tire pressure sign today and i went to the gas station to check which tire it was. after i checked only 1 tire was out of air. I fill it to 39 since it was in the back and went on my way. pushed the button and drove home. Still the sign is there. the tire i filled air with was a run flat tire that was supplied in the back trunk. is that suppose to be at a higher psi? i have 17's btw and running OEM tires and wheels. and my other 3 tires are not run flats.

__________________
2005 Black x5 3.0i