O2 sensor code

[VillanoSr]

ok guys and gals.......

so my wife passed on to me about the O2 sensor being bad (downstream one). so i replaced the sensor,(and oh yeah, there not interchangable due to the wiring harnesses that are on them) and went down to advanced auto to have them erase the code and clear the check engine light. So life is good, i saved the day, and fixed the problem right?


WRONG! has im driving down to Norfolk, about 25 miles into the trip, the light comes on and stays on all trip.

I get to norfolk, the jeep sits all night until the next morning and i start it up. Guess what, no check engine light!

So my question to you all smart jeep folks is, are we dealing with a sensor problem, or is it something else? Can large tires cause this? Some i talk to say yes, some say no... HELP!!!!!!!!!

[korisu56]

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Skill set---->

Good luck and keep us informed. Hopefully the more seasoned folks can jump on this.

[brownrc]

My brothers 04 TJ would come on and then go off after awhile never did find the problem. He had 32" tires on it so I don't know if that could cause it or not.

[VillanoSr]

mine are 33's so thats interesting.....


is there a better diagnostic test that can be done to pin point an exacrt location of why this is coming on?

In my earlier days, i was an aviation electrician before converting over to master at arms, so im good with a multi meter and schematics.

[korisu56]

Though it is above my skillset, I'm going to go out on a limb and say its not the tires. Maybe you just have a bad connection, causing a break in the sensor's current, which would in turn cause the computer to assume something's isn't performing up to snuff. Mind the disclaimer.

[JEEPINUSA06TJ]

Have you googled "02 sensor code" for your particular year Jeep? If so and you got nuthin, defenitly take it to the dealership. I was having the airbag light go off. I broke my sector shaft on my gear box! Yaaaay for me.The airbag never deployed. I disconnected the battery, thought that would fix it. But did not. Som I brought it to the dealership and they corrected the problem. FREE. I googled the problem first and there was enough info about it. Good luck. JEEPS RULE DUALLIES DRULE!

[TheRenegade]

Problem------>

Skill set---->

Good luck and keep us informed. Hopefully the more seasoned folks can jump on this.

I think it's time for a "resurgence":

[TheRenegade]

I think it's time for a "resurgence":

Alright, right pic:

[crazy4ink]

Your larger tires are NOT causing an O2 sensor code. To put it in perspective, I am running 40" Iroks and I am not throwing O2 codes. It sounds like you have a code stuck in your computer.

There are 2 kinds of codes; a hard code and a soft code.
- A hard code will illuminate your MIL. This is to tell you that there is a code in your computer and that a potential problem exists.
- A soft code will also illuminate your MIL, but typically will got out after you turn off your ignition.

Even though you went to Autozone and they erased your code, it won't necessarily erase the code's imprint on your computer.

To really get rid of any hard codes, pull both your battery cables off of your battery. Hold the positive and negative cables to eachother (off of the battery!) for no less than 45 seconds. Put the cables back on your battery and start your vehicle. Let it idle for at least 1 minute before shutting it back off. It will take 50 cycles of your ignition for your computer to relearn it's perameters. After that, more than likely, you won't get a MIL with an O2 code.

[VillanoSr]

thats awesome. i will do that. I have not gotten the light or the code back so it is probably what your calling a soft code. I appreciate all the help. Im down here in VA still and will be heading back this weekend. i will keep you posted.....