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The part number I used was 4412 Champion Truck plugs. They were obviously fouled and dirty when he gave them back to me.

The problem turned out to be the wrong plugs. The Champion Truck plugs that I put in were the wrong ones. NGK plugs were the proper plugs for the 00 and 01 XJ's. This was throwing a misfire code which then prompted the o2 sensors to trip, thinking it was a cat problem. When the service guy...

Yes, they are telling me that since it is a 01 and Jeep doesn't think I should have enough miles on it to be a problem, there isn't a aftermarket part for it. My muffler guy was the one that told me I had to purchase a Jeep Authorized replacement part for it. The service station stated the...

Thanks. I decided I have to take it to the Jeep Authorized Dealer to have it fixed. With the headache I have experienced over the course of the week, I decided the grand is worth parting with rather than years off my life. Thanks again for all the advice, and I will be more knowlegeable if...

Thanks for the info, but it seems that our systems are a little different. There are two smaller catalytic converters right off the header, with corresponding O2 sensors before and after these units. The approximate size of these units are 4-5 inches in diameter and about 6 inches long. They...

I have a 2001 XJ with 123,000 plus miles. Needless to say my MIL started blinking and come to find out the catalytic converter falied. Any thoughts or recommendations for a replacement part. Some of the quotes from Jeep dealers are around $1000 to replace all the units plus labor costs. I...