I'm curious, in your experience, what life would you expect out of the
original Honda Catalytic Converter?

More specifically, here's my background FYI:
1998 Accord V6 with 145000 miles, half freeway, half stop-and-go driving
everyday for two hours total a day.

Recently, the MIL was on with 3 codes:
P0401(67) - EGR Insufficient Flow Detected
?????(90) - EVAP Control System Leakage
-Two codes transpose to (90).
P0420 - Catalyst System Efficiency Below Threshold

I had the local Honda dealership perform the EGR port clean for free under
the past recall. But that night after the service, I received P0420 again.
I returned to Honda hoping I could find another item under warranty, but no
luck.

I've been told that I need a new catalytic converter. Obviously, I
questioned them as to how they arrived at their conclusion, confronting them
about checking more than just the MIL, e.g. exhaust manifold pressure, etc.
The response was that it was not necessary, and the computer only test was
very accurate.

I do plan on doing plenty of testing myself before buying a new converter,
but the part that struck me was the fact that I was told repeatedly that
145K mi was "well past" the lifetime of the converter.

Any thoughts?

Thanks in advance.