have the wave forms of front and back sensors looked at first. if rear sensor level is low and flat then the sensor may be the issue. if it is active and looks like the same kind of activity as the front then the cat is likely the issue. and you can just bolt on new complete cat assemblies if you like.
I'm going to take a peek underneath it first to see if the new sensor worked itself loose; hopefully that is the case and I fix it. If not, I'm taking it in Wednesday for an oil leak fix and I'll see if they can scan it then.
I got a bunch of parts to install been buying parts all winter and its starting to warm up!! been at it since 11 am till 10 pm ohhh even got my rear wiper working and new 14'' wiper blade on..Winning i like my black led bumper lights gives the ole hoe a newer look. My headlights have halos and i'm not to into it..Kinda to ricey for me IMO..