2008 Toyota Prius lifespan?

If it has been diagnosed that the catalytic converter has failed then replacing the oxygen sensors won’t help. Some people try replacing the oxygen sensors in hope of a cheap repair only to be disappointed.

It is common knowledge in the auto business that the oil return holes for the oil rings clog in Toyota pistons. There are several warranty extensions to replace pistons to correct this but none apply to your Prius.

That’s really the question. Just getting a CEL and an OBD code isn’t enough to diagnose the cat, right?