P0138 code though JEEP running great / can I reset computer? - Jeep Wrangler Forum

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Old 07-30-2008, 06:20 PM
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P0138 code though JEEP running great / can I reset computer?

Ok, here is the long story short:

I drive a 1998 Jeep Wrangler Sport 6 cyl, and last year I got caught in a horrendous rain storm. Ever since that my Check Engine Light has been going off and on. Periodically all my dashboard controls stop working and I have to tap the glass to get my MPH, etc to register. Nothing else seems to be wrong with the car, it's running great, and I have a lot of work done to it the past 2 years (including replacing the oxygen sensors.)

This morning the check engine light was not on when I drove to the store. But doesn't it figure that it pops on when I take my car to get its annual inspection?? Of course it does. And of course they won't pass it because the light was on.

It threw a P0138 code: the input voltage from 02 sensor 2 in bank 1 is too high.

I went to Autozone and got a new O2 sensor. Got in the car, and no more check engine light.

So here is my stupid question because I am not auto-mechinally inclined: is there anyway all of that rain caused some sort of short??

I dont mind having the o2 sensor replaced, even though it seems like I just did that, but i don't want to spend money to have it replaced and not fix the problem and fail inspection again.

Just wondering if anyone had any advice or experienced anything like this before. Like I said, my Jeep is running perfectly great.

Will resetting my check engine light by disconnecting the battery at least let me pass inspection? I know I am not supposed to do this but I really don't think there is anything wrong with my Jeep. Do I have to drive a certain number of miles after disconnecting the battery in order to get the readiness codes back on track so it will pass?
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Old 07-31-2008, 10:58 AM   #2
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yes that oxygen sensor needs to be replaced its shorted out. make sure its plugged into the wire harness all the way. simply unpluging your battery will turn off your engine light but it also leaves the possibility of the light coming back on duriong the inspection. as far as you gauges it sounds like a loose connecter in the back. take of the cluster and plug it back in.

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Old 07-31-2008, 11:04 AM   #3
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The smog test machines are smart enough to detect if the battery had been recently disco'd to reset the codes. It won't pass the test if the car/Jeep hadn't been driven enough after having them reset. Some of the codes the smog test machine tests depend on it being driven enough miles first.
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