Owners of 2001 Cherokee's i need some help from you
Senior Member
Joined: Oct 2011
Posts: 600
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From: new iberia
Model: Cherokee
Originally Posted by Tx9h6e4cuda
Ok this is what the deal is, I bought my Jeep from a 17 year old moron who never should touch a car again. He hacked the exhaust directly off after the cat (taking the 02 sensor with it). He bolted up a glass pack and called it good. I bought the Jeep I sourced another exhaust system from a 2000 XJ. I installed it and it had the second 02 in the exhaust but my truck does not have the wiring anywhere. I've looked at the wiring that goes to the transmission (nearest harness to exhaust) and nothing there for a connector or loose harness or wires at all. I'm afraid he cut the 02 wiring off at the main harness wherever it goes. I understand what the downstream 02 sensor does, where the sensor goes, and etc.
What I am looking for is someone to please climb under their 2000-2001 Cherokee and trace the rear 02 harness to where it meets the main harness. I know the moron previous owner did something bad here I just need to find out where he did it but I don't have another example near me to compare. A pic would be awesome too......
Also my check engine light doesn't work, it doesn't do test mode when the key is turned to accessories or even in the factory test mode. I replaced the bulb and nothing still.
Thanks for any help.
What I am looking for is someone to please climb under their 2000-2001 Cherokee and trace the rear 02 harness to where it meets the main harness. I know the moron previous owner did something bad here I just need to find out where he did it but I don't have another example near me to compare. A pic would be awesome too......
Also my check engine light doesn't work, it doesn't do test mode when the key is turned to accessories or even in the factory test mode. I replaced the bulb and nothing still.
Thanks for any help.
Thread Starter
Seasoned Member
Joined: Dec 2011
Posts: 250
Likes: 0
Model: Cherokee
Here is my emissions sticker off my XJ.
I am from Minnesota and my jeep was sold new at a dealership in Edina Minnesota. My Jeep looks like the California emissions figure from above as my Jeep has two cats in the exhaust manifold but mine only has two 02 sensors in the rear bank of the pipes. One 02 is above the rear cat and the other is below the rear cat only. There is no plug in for a 02 sensor in-between the rear cat and muffler and it doesn't look like its ever had one.
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Yes that's the California emissions package. There are 4 O2s, upstream and downstream of each cat in the exhaust manifold. So you're saying that the forward cat doesn't have any O2 sensors around it?
Thread Starter
Seasoned Member
Joined: Dec 2011
Posts: 250
Likes: 0
Model: Cherokee
No the front cat does not have any 02 sensors in the manifold.
I don't get it, this Jeep was sold new in a federal emissions zone, the build sheet from the dealership showed federal emissions, but the tag on the firewall shows California emissions? Something really hinky is going on here.
I don't get it, this Jeep was sold new in a federal emissions zone, the build sheet from the dealership showed federal emissions, but the tag on the firewall shows California emissions? Something really hinky is going on here.
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
No the front cat does not have any 02 sensors in the manifold.
I don't get it, this Jeep was sold new in a federal emissions zone, the build sheet from the dealership showed federal emissions, but the tag on the firewall shows California emissions? Something really hinky is going on here.
I don't get it, this Jeep was sold new in a federal emissions zone, the build sheet from the dealership showed federal emissions, but the tag on the firewall shows California emissions? Something really hinky is going on here.
You'll be wanting to install some O2 sensors
Thread Starter
Seasoned Member
Joined: Dec 2011
Posts: 250
Likes: 0
Model: Cherokee
So there are supposed to be four in the 2001 exhaust manifold? I've looked twice and there are no areas in the front cat with 02 bungs. How would I go about installing 02 sensors when there is no wiring for them?
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
No the front cat does not have any 02 sensors in the manifold.
I don't get it, this Jeep was sold new in a federal emissions zone, the build sheet from the dealership showed federal emissions, but the tag on the firewall shows California emissions? Something really hinky is going on here.
I don't get it, this Jeep was sold new in a federal emissions zone, the build sheet from the dealership showed federal emissions, but the tag on the firewall shows California emissions? Something really hinky is going on here.
EDIT: If your 2001 was built in 2000 you may have the 2000 exhaust system, i.e., two cats, and only two O2S's.
Check the OEM Model/Part number on your PCM...
The 2001 PCM model/part number for 2001 should be 56041 801AA, for both Federal and California Emissions.
The 2000 PCM model/part number for Federal Emsissions is 56041 634AE, and for California Emsissions, 56041 635AE
The 2000 exhaust system had two O2S's and the 2001 had four O2S's.
If your 2001 XJ was built in 2000 there's a possibility it was configured as a 2000 Federal Emissions but as a rule the California Emissions label was placed on your firewall because it was a 2001 model year XJ.
If your front Cat doesn't have upstream and downstream O2S's it may be a normal configuration; provided, however, you have a Federal Emsissions is 56041 634AE PCM.
Last edited by CCKen; Apr 12, 2013 at 08:48 AM.
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