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Old 09-12-2012, 02:25 PM   #1
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Code help

P0138 1/2 o2 sensor shorted low voltage.

Any help would be appreciated. I have never fooled with these before.

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Old 09-12-2012, 08:16 PM   #2
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look to see if the wires are shorted. If not, buy a new O2.

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Old 09-13-2012, 06:32 AM   #3
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Don't buy anything but stock especially Bosch O2 sensors. Jeeps doesn't like any other O2's but stock. Believe me I know I wasted alot of money this year b4 i figured this out. And also another word of advice don't buy Bosch spark plugs either.
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Old 09-14-2012, 08:01 AM   #4
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I know some of these are before and some after the cat. 1/2 would be????
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Old 09-14-2012, 09:26 AM   #5
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Bank 1 (front three cylinders) Sensor 2 (downstream sensor-the one after the mini catalytic converter)
Have a look at the wiring and the connector for possible problems. If they are ok, then it is probably a faulty sensor.
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Old 09-14-2012, 09:44 AM   #6
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Appreciate it. This is my first Jeep and only had it a few months. Trying to figure out everything..............I know one thing for sure, like somebody put in one of my post, JEEP - Just Empty Every Pocket! haha

If not fixing stuff, its adding stuff! But I love it. Wanted one for about 10-15 years. And hell, money has to be spent somewhere. haha

Thanks for the help.
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Old 09-25-2012, 08:17 AM   #7
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I could only find 2 o2 sensors. And they were both before the cat.

One was just about below where the pass feet would be and the other was between that and the cat kind of hidden above the skid plate.

?????????????????
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Old 09-26-2012, 07:06 AM   #8
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Bump....
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Old 09-26-2012, 08:55 AM   #9
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Sounds like you've located both of the downstream O2s (one of these you will be replacing according to that code)
Now pop open the hood and on the drivers side look at the exhaust system right above the pre cats. there you will find 2 more O2 sensors. These are the upstreams for bank 1 and 2. Bank 1 is towards the front of the motor.
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Old 09-27-2012, 06:29 AM   #10
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thanks.....

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