Wow back from the dead. ZaFarm I have the 4.0 not sure how much difference that makes on this issue.
I'm at 116k now and I still haven't fixed it. I figure its the cat, but its on and off and it is still the only code it has ever thrown so I have just ignored it. Jeep runs well and still gets above average mpg from what I've seen posted here. Its been off for about a week now. I will say as time has gone on its been on more than off.
When forced to deal with it I'm thinking about just doing a whole new Kolak exhaust for it. I've also considered doing the internet "urban legend laquer thinner burn" in it as well, at this point I'm not gonna hurt anything by doing so.
I have not had any fuel pump issues I don't know if that has anything to do with your problem or not.
STOCK WJ WARRIOR
2004 4.0 Laredo Selec-Trac at 140k
General Grabber AT2's