Sounds like tire pressure light or perhaps check engine light.
it is the tire pressure light. just check your tires
Low tire pressure
That indicator light is a low tire pressure light. It is activated when one of your tires are low.
Looking for a Used tC in your area?
CarGurus has 3,568 nationwide tC listings starting at $1,500.
Search Scion tC Questions
Scion tC Experts