Have you ever had the upstream O2 sensors (there are two of them) replaced?
I have heard that bad upstream O2 sensors can ruin a catalytic converter.
1996 Contour SE Sedan 4D (Royal Blue) Duratec V6 2.5L 24-valve DOHC Automatic 75,000 miles No Mods (unless you call the DMD a mod) Replaced EGR valve (gunked up), EVR (EGR VR), PCV valve, and evaporative emissions hose (cracked).
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