I have a 2009 Toyota Corolla. My low tire pressure warninglight came on 9/24. on 2009 Toyota Corolla

I had the tire pressure checked on all 4 tires today and they were low just a little. More air was added. The light is still on.

Asked by for the 2009 Toyota Corolla
Check the psi again, also the spare MAY have a sensor as well.