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Can Glowing Cats Fry O2 Sensors On '92ls400?

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About a month ago the LH side coil went bad resulting in red-hot glowing cats - both of them! Anyway with help from threads on the forum, identified the problem as being the coil, changed it and performance improved. Now I am getting CEL codes 25 (air/fuel mixture lean), 26 (air/fuel mixture rich), and 41 (Throttle Position Sensor)!

And here is a peculiar thing - the CEL does not stay on all the time - sometimes it simply goes away, other times it stays on for several days. Performance has also dropped when the CEL is on. Can this be a sensor malfunction, or a bad ground?

Does anyone have any experience with this happening after a coil failure - does the glowing cats destroy the O2 sensors? I believe the main O2s are pretty close to the Cats. If not, can the TPS alone account for this contradiction of the fuel ratio?

Any help will be greatly appreciated



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