When l went in for new tires the air pressure light was on solid like l needed air, when l got in my car and left l noticed that same light was now blinking.
Have the new tires place see this.
Blinking TPMS light usually means on or more of the TPMS is bad. Have them replaced.
The TPMS in my 2006 Sienna has to be reset after a tire installation. The procedure is in the Owner’s Manual. The TPMS does not use tire sensors, again explained in the manual.