error code question?

I pulled a couple codes off my check engine light one that I can't find is I'm flashing code 77? And 72 anyone know what these are and what parts I need?

77 is a speed control relay. I don't have a 72 listed in my manual, but a Google search says that is for "catalytic converter efficiency failure".

If birchs remarks are accurate, you have a few possiblities for the converter code. Bad Coverter, Bad O2 wiring, Bad O2 (front or rear), Bad computer. Most likely is a bad o2 or a bad cat.

Honestly, I would clear the system and see what resets before I spend any money.