My TPMS light stays on, no flashing. Each tire shows 32 psi like listed on the door. I did the relearn, got the horn honk and directional light for each tire. Re-learn, then inflated all for tires and spare to 35 PSI, drove over 100 miles on a trip, light stays on and dash still shows all 4 tires properly inflated.

Do I need new TPMS sensors? Or could it be something else?

2008 Tahoe LS, 220,000 miles, sensors worked until recently., originals been replace several years back.

 

Get a full diagnostic scan with a professional tool. Maybe the sensor batteries are starting to go