try torque: https://play.google.com/store/apps/details?id=org.prowl.torque&hl=en_US&gl=US

https://www.s197forum.com/threads/how-to-check-emissions-readiness-with-the-torque-app.138589/

When you replace the thermo did you make sure the jiggle pin was in the upmost position? When you bled the system you make need to rev the system. Check for your cars specific bleed procedure.