No Accel Problem.

[Cherokeekid88]

according to the guy at Firestone, its not a matter of distance its a matter of depth. he is saying that the people did my exhaust last used a nut that is pretty thick and the 02 sensor is not far enough inside the pipe to get an accurate reading and that is whats throwing the code....I haven't seen the said nut yet, but will check it out this afternoon.

Anyway, The guy that I am taking it to tomorrow said he will fix it for $20...I will check out the fuse for the heater circuit as well this afternoon.

 

[Ecomike]

I can't speak for the circuitry of the '00-'01 as I don't have one, but I know they still use the 4 wire O2 sensor and I'd be surprised if the heater was just floating in Limbo vs. being used.

Someone with a '00-'01 will have to chime in on the circuitry for the heater.

It could be that it was the California emissions package only that changed the way I described. I do know it was a dual O2 sensor (2 wire IIRC), dual pre cat for California I was reading about and discussing recently, but I thought I had read about pre cats on earlier jeeps, as far back as 97, but I am not sure. Mine are all Renix.

 

[Ecomike]

I can't speak for the circuitry of the '00-'01 as I don't have one, but I know they still use the 4 wire O2 sensor and I'd be surprised if the heater was just floating in Limbo vs. being used.

Someone with a '00-'01 will have to chime in on the circuitry for the heater.

See the picture in post nine!

http://www.naxja.org/forum/showthread.php?t=1079789&page=2

"Originally Posted by Tim_MN
Some 2000 XJ's were built with CA emissions, mini-cats and 4 O2 sensors, even ones that were not delivered to CA dealerships. All 2001 have CA emissions, mini-cats, and 4 O2 sensors."

They all look like 2 wire sensors!!!

And now I am wondering if the dual Pre cat proximity to the head, and special manifolds helped to kill the 0331 heads when the engine ran too rich!!!!!!!!??????

 

[Shorty]

2001 all had the same precat. emissions package and it looks like a 4 wire to me-- I don't think I've seen a 2 wire on any XJ (Cali. or Federal)


Hover over the image to zoom in





Bosch Premium Oxygen Sensor




Oxygen Sensor OE Type - Upstream Front
Yes, this part fits your 2001 Jeep Cherokee. Change vehicle

 

[Ecomike]

2001 all had the same precat. emissions package and it looks like a 4 wire to me-- I don't think I've seen a 2 wire on any XJ (Cali. or Federal)


Hover over the image to zoom in





Bosch Premium Oxygen Sensor




Oxygen Sensor OE Type - Upstream Front
Yes, this part fits your 2001 Jeep Cherokee. Change vehicle

Agreed, I checked AZ also, all seem to be 4 wire. So it seems Jeep stuck with the 4 wire system.

 

[Cherokeekid88]

Checked the fuse for the heater circuit...was bad...replaced it...feels better....but still took it to get the bung replaced to have the sensor further in the pipe. Guy said he fixed it and the light is gone and is no longer throwing codes....

 

[Ecomike]

Next question, why did the fuse blow?

 

[Cherokeekid88]

Just got the jeep back. The guy moved the o2 sensor about a 1/4 of an inch further in the pipe. Jeep feels good now, no CEL. Hopefully that did the trick.