On this thread you advised that tire sensor(s) should be replaced:
Daughter took the car to her regular chain tire store for oil change and for advice on the sensor(s). (They treat her right, and have been reliable. and she keeps an eye on oil level and tire pressure.) they diagnosed a single bad sensor. She had them replace it, but there was some issue about resetting it (second hand info here; not clear), and the store did not charge her. Hard to believe, and I can’t see any difference from the outside (no surprise), but the invoice really says “TPMS service”, with no charge. They suggested she take it to a dealer to get reset.
Internet search indicates that you really do need special tools (electronic) to reset the system after changing a sensor. Is that right?
If so, we will check with our trusted independent mechanic, or go to a dealer, depending on the cost/convenience trade-off.