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Just reading the rest of your post. With a scope you can see if the cat is bad by looking at the front & rear O2 sensors during and after a propane test. From what I read cats can go into melt down through excessive heat. An exhaust back pressure test would tell you if the cat was blocked...

A bit late to this thread as I found it on a google search for other stuff, and joined so I could answer. I may be able to answer at least one of the questions. Titania lambda probes are often 0v/5v switching, but not always. However the scantool representation of them can be significantly...