Gut it and put in the O2 Simulator for the post-Cat sensor. It's just a resistor so could even just pop one of them in.2006 Scion XB...bought with 247K for $500. Fleet car. Currently 291K with 1 alternator, 1 water pump, and 1 front hub/bearing. Everything works and gets 32-35 MPG.
Absolutely soul-less, but cheap
Currently it has decided that the Cat is inefficient, started about a week ago. Pondering course of action. It for sure won't be getting the $1200 OE replacement
I'll stand behind the Civic I have, bought it used at 98k miles from the previous owner in Jan 2019. Gets a solid 37+mpg. I have over 150k on it at the moment, change oil and rotate tires every 6k. That 2006-2012 generation has the R18A1 Engine in it which has a Timing Chain, not the Timing Belt most other Honda stuff is known for. Good for 350k miles, literally drive and maintain properly. The only thing I've done is an AC Compressor because the bearing on the pulley went out and it can't be replaced so you have to do the whole thing.. 🙄