00 cherokee has4 Rough idle
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Newbie
Joined: Jan 2012
Posts: 2
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From: Pa
Year: 2000
Model: Cherokee
Engine: 4.0L
Had cel codes for all four o2 sensors and cylinder 3 & 5 misfire
I replaced all four o2 sensors and reset the cel and drove for 2 days and the cel came back on and its saying the same thing. Any advice would b helpful
Going to try new spark plugs this weekend
I replaced all four o2 sensors and reset the cel and drove for 2 days and the cel came back on and its saying the same thing. Any advice would b helpful
Going to try new spark plugs this weekend
CF Veteran




Joined: Nov 2010
Posts: 5,841
Likes: 117
From: In the middle of Minnesota!
Year: 1999
Model: Cherokee
Engine: 4.0
Post the EXACT codes for the most accurate replies. It really is important as interpreting codes is an art.
If those code descriptions contain the word HEATER for more than one sensor, it is very possible that you have a blown fuse in the power distribution center under the hood on the passenger side (black box). That fuse controls the "heater circuit" for all of your oxygen sensors and if it's blown, you are going to have all kinds of mayhem. I believe it is slot 24, but not certain of that. I am certain however that it is a 15 amp mini fuse, so be darn sure that all of those are good!
If those code descriptions contain the word HEATER for more than one sensor, it is very possible that you have a blown fuse in the power distribution center under the hood on the passenger side (black box). That fuse controls the "heater circuit" for all of your oxygen sensors and if it's blown, you are going to have all kinds of mayhem. I believe it is slot 24, but not certain of that. I am certain however that it is a 15 amp mini fuse, so be darn sure that all of those are good!
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