driving the old ladies '98 cherokee classic 105000 miles(stocker) we havethe check engine light on autozone claims it is low voltage coming from the rear o2 sensor jeep runs fine no missing or other problems but that annoying light!!! just looking for a little direction here what to check next. Also does anyone live in the akron ohio area with spare parts? cross-members, brakes, axles anything let me know please.

 

the o2 sensor is probably on it's last leg. Autozone sells replacements.

 

some code readers will clear codes for you, otherwise disconnect your battery cables and touch them together and leave them like that for like 15-20 mins. will clear the codes and get rid of that CEL light.

 

Mine has the light on too. It throws codes for both O2 sensors. I replaced them both, and the light is still on. I reset the computer. The light went out, but came back on??? Still throws the codes even with new sensors.

 

Mine stas on too, But gives a code for the catalitic converter. I just reset it a few days before inspection time...


I would check the wiring to the O2 sensor ! It may be damaged..

 

Post up in our wheeling neighborhood. You would be a great lakes member!

 

Usually when an O2 sensor dies or starts to die, the CEL is all you will see. There is no associated signs out of the motor. It will usually continue to run fine. You notice a loss in your fuel mileage, though. They are pretty easy to swap out.

 

Acording to the shop manuals the ONLY reason for the rear O2 sensor is to indicate that the catalitic converter is nearing the end of it service life, and will require replacement.
If your rear O2 is constantly sending a cel, you probably need the cat replaced then.
That IS the rear sensors job yanno?

 

Thankyou it was the rear sensor and the codes needed cleard but it makes very good sense that the cat might be going out. p.s hope everyone takes advantage of autozones warranties there just free parts

 

What state do you live in that does inspection?