The check low tire pressure keeps coming on and when I put air in the tire on 2006 Acura TL

it goes off. I have been told there is no leak found in the tire. How do I know if it is the tire sensor or not?

Asked by for the 2006 Acura TL
there has to be a leak if you have to add air at times. if you have chrome wheels ck for rust at tire bead seal very common