why does the check air pressure light keep coming on on 2006 Buick Rendezvous

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
front left tire went flat and had to be replaced. all tires are the same size and make and all have min of 36psi.
(1) Answer
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most tire pressure sensors must be "reinitialized" and most tire stores can do that for you. these sensors are
actually transmitters that have a built in battery. the
battery will last 5 or 6 years, then you must replace the
sensor because it's a sealed unit.