Emissions - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 4 Old 03-05-2019, 02:04 PM Thread Starter
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Emissions

I took my 2012 JKU in for an emissions test today and failed. They said my oxygen sensor was turned off and I would need to reset the Jeeps computer to the factory settings for it to pass emissions. I am running 37's on the jeep and the only mod I have done is with the AEV Procal to reprogram the speedometer for the larger tires.

Can anyone tell me how to reset the Jeep computer to factory settings so the oxygen sensor will be on?
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post #2 of 4 Old 03-05-2019, 02:40 PM
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Quote:
Originally Posted by csichoice View Post
I took my 2012 JKU in for an emissions test today and failed. They said my oxygen sensor was turned off and I would need to reset the Jeeps computer to the factory settings for it to pass emissions. I am running 37's on the jeep and the only mod I have done is with the AEV Procal to reprogram the speedometer for the larger tires.

Can anyone tell me how to reset the Jeep computer to factory settings so the oxygen sensor will be on?
Are you sure O2 is just not at Readiness?
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post #3 of 4 Old 03-05-2019, 02:43 PM Thread Starter
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not sure what you mean by readiness
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post #4 of 4 Old 03-05-2019, 04:13 PM
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Get your hands on a basic OBD-II scanner. Amazon has them for $15-100. You just need to be able to read codes and check for I/M readiness. My favorite cheapo scanners are the orange Foxwell scanners with the I/M button. Makes it easy.

You should be able to see if there are any error codes. If not, you should be able to next look at the readiness of the different emissions-related components of your Jeep. In CA, for example, all available components must be in a ready state. Some states allow a certain number to not be ready.

If you have recently (or not so recently) had your battery disconnected, your Jeep is going to need to perform a drive cycle that gets the emissions monitors into a ready state. If you have used a tuner, it can also reset readiness monitors.

Typically there's a drive cycle you might need to follow to get them to ready. I did some digging and found this -- not sure if it's accurate, but worth a shot. https://www.dropbox.com/s/g6urgu18u6...cycle.pdf?dl=0

In my experience, CAT / O2 monitors always take the longest to come to ready. Also, when you go get a smog check, the tech will usually plug in a scanner and check for readiness. If there are monitors not in ready state, they will kick your vehicle back to you. Having an el-cheapo scanner to check for readiness before you go in will save you time at the inspection station.
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Last edited by snout; 03-05-2019 at 04:17 PM.
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