The code is P0420.
The ‘code definition’ reads: Catalyst System Efficiency Bellow Threshold (bank 1).
Car inspections here in Houston are not the kind you can just easy get past like they used to be due to our area-wide high pollution.
My next step, if I could not find a solution, was to just take it to a dealer. But I spent so much money already that things are getting aggravating.