No downstream o2 Sensor but no CEL either
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Location: Topeka, KS
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Year: 1996
Model: Cherokee
Engine: 4.0
No downstream o2 Sensor but no CEL either
My 96 XJ doesn't have a downstream plugged in. The PO either pulled out the wires for the sensor or they got caught on something and pulled out. Anyway today I cleared the codes because I finally got to the junk yard and pulled a pigtail and sensor from where the PO cut the old one off for the battery sensor. When I cleared the codes the CEL never came back on like I expected it too. I know one of the previous codes was the downstream o2 sensor. I drove it for about 20 miles and have done several shut off and starts in the driveway. Just curious if this kind of a normal thing once the code is cleared that it takes a while to come back on. I figured it would throw the code immediately or at least after everything warmed up. Should I be worried about something else screwed up now?
#2
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Model: Cherokee
There was an ECU software upgrade for '96 to fix that specific problem- the CEL wouldn't always turn on when the rear O2 detected a failed cat. They usually did that upgrade when you brought it in for the failed cat. (another '96 problem- first replacement is free)
Could be you haven't driven enough too.
Could be you haven't driven enough too.
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Year: 1996
Model: Cherokee
Engine: 4.0
Anyway, light came back on first thing after I made this post last night. All the codes are related to that sensor. Going to order the sensor today since I got my tax return I set aside a bit for doing some necessary repairs. Just hope all I have to do is replace the sensor to get the CEL off. My goal for the first 6 months of this year with my XJ is to get the CEL off and get all my leaks fixed and a very thorough tune up. If I have to put exhaust on to fix the CEL thats going to slow the other stuff down as I only have about $200 set aside at the moment just for my Jeep. If I can do that I will start on some other cosmetic repairs (windshield, tires, lift etc.)
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