I recently had my mini cats go bad on me and ended up clogging up my exhaust on the way to work. Caused all sorts of misfire and other issues but I limped into work and order a new catalytic converter set first thing with 2 day shipping from RockAuto.
I carpooled with my wife for the 2 days and installed the cats over the weekend. The cats I ordered were Eastern Catalytic P/N 20379. All was going perfectly well with the install and fitment until I got to the O2 sensors (at the very end of course). Three went in no problem but the front lower was a little tight. I didn't think too much about it figuring the older, rusty O2 was just a bit snug in the new bung.
So I happily jumped in and fired up the Jeep, glad to be finished seeing the check engine light that's been on for a few months (the older cats were on their way out for a while). But still engine light's on. I pull the code and it's for the front lower O2 sensor.
I pull the sensor and the end is GONE. So I have to drop the entire cat assembly, and once I do I find that the lower front bung is off-center of the hole and the weld has penetrated so much that it contacted and ripped off the sensor head!
I ended up getting a new sensor and a grinding head for the drill. A good solid 20 minutes of grinding at the bung weld (and trying not to destroy the threads) and I was able to get the sensor in without it ripping apart.
I have a photo of the remaining sensor pieces that I fished out of the assembly that I'll post up in a bit. But mostly, I wanted to let others know of the poor quality and lack of inspection on the Eastern Catalytic products. I read others here and elsewhere recommend them which is why I choose them however after this, I'd AVOID them completely.