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Sometimes its because your gas cap is not sealing well. Try making sure the cap gets put on with at least 3 clicks after tightning. Next try a new cap.
I have hads this happen to me before on 3 vehicles. First time , I got swindled like you changing o2 sensores EGV valves , etc , etc. Now I just make sure the cap is sealing and in aweek or so the light goes out and doesn't come on again.
Now that said , have you looked at the spark plugs? Any chance one cylinder is skipping now and then? That will set off emission lights and could damage the Cat coverter and with a big engine , you may not even notice it happening until you are looking for it.
You could have a bad cykider firing do to a plug , a wire , etc , etc but they usually catch that. I wasted a ton of dough like you to find out it was because my gas cap wasn't sealing.
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