1998 S70 CEL on again.....

[Mr. Detail]

Hello all;
I am back again and trying to figure out my next move. I have had the annoying problem of my CEL illuminating and I can't seem to turn it off for good or at least to get it thru PA state inspection.

Here is the latest. Driving in to work yesterday morning and the CAT converter broke away from its rear connection pipe. Embarassing noise to say the least. Made it to work and dropped it off at my local Indy shop. He replaced the CAT with a new one and erased all codes which turned off the CEL. I was hoping that replacing the CAT would take care of this issue but low and behold after only 35 miles of driving the CEL is back on. I pulled two codes this morning in the parking lot. (P0133 and P0140)

I have already replaced both the front and aft O2 sensors at least once within the last year. Replaced with Bosch. I drove the car all of this past winter with the CEL on so can anyone tell me can a bad CAT burn out a new O2 sensor?
Also I have not yet attacked any of the vacuum lines as might have been suggested to me previously.
Tired of throwing money at this car just to get the CEL turned off. Any suggestions would be much appreciated as I have an August 2015 state inspection due and they won't touch the car with the CEL turned on.

1998 Volvo S70 (Base) 147k miles

[DrJammer]

I would bet a bad Cat to ruin any 02 sensor if run for months, but I'm sure others know more

here is a link that may be similar

https://www.matthewsvolvosite.com/forums ... 33#p369794

I am very nearby, PM me if I can help further. Just a DIYer myself.