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Old 04-21-2014, 02:23 PM   #1
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Error code P0123 help

I just tried to get my 2004 Jeep Rubicon inspected and it threw 2 codes.

P0123- Throttle/Pedal Position Sensor /Switch A Circut high output

P0138- O2 Sensor Circut high Voltage (Bank 1 sensor 2)

Asked the guy at the shop and he didnt know anything about the first code and said I shouldnt fix the O2 code because it may be what is causing it

Anybody else had this problem, or know where I should start?

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Old 04-21-2014, 02:26 PM   #2
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Originally Posted by Chriscoe View Post
I just tried to get my 2004 Jeep Rubicon inspected and it threw 2 codes.

P0123- Throttle/Pedal Position Sensor /Switch A Circut high output

P0138- O2 Sensor Circut high Voltage (Bank 1 sensor 2)

Asked the guy at the shop and he didnt know anything about the first code and said I shouldnt fix the O2 code because it may be the first that is causing it

Anybody else had this problem, or know where I should start?
It sounds like the first code could be your Throttle Positioning Sensor. It's a fairly common part to go bad on our Jeeps. You might try cleaning it out, but if that doesn't work you can replace it and it may fix both codes. Let me know if you have any questions!

-Ryan

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Old 04-21-2014, 02:40 PM   #3
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Okay but everything I have read is telling me it is a plug under the steering wheel
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Old 04-21-2014, 04:21 PM   #4
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I guess I will start with replacing the throttle position sensor.
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Old 04-21-2014, 10:38 PM   #5
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Anybody have any ideas?
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Old 04-21-2014, 10:54 PM   #6
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Quote:
Originally Posted by Chriscoe View Post
I just tried to get my 2004 Jeep Rubicon inspected and it threw 2 codes.

P0123- Throttle/Pedal Position Sensor /Switch A Circut high output

P0138- O2 Sensor Circut high Voltage (Bank 1 sensor 2)

Asked the guy at the shop and he didnt know anything about the first code and said I shouldnt fix the O2 code because it may be what is causing it

Anybody else had this problem, or know where I should start?
Had both recently on XJ....replaced the sensor AND the O2 sensor in the catalytic converter and both cleared.

I tried doing just the sensor to see if it would clear both...no luck...123 was gone, but 138 was still there. XTRyan is right...both parts are pretty common on the 4.0.
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Old 04-21-2014, 11:33 PM   #7
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Ok I'll head to advanced tomorrow and pick up some parts
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Old 04-21-2014, 11:37 PM   #8
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Anyone know of any good write ups regarding replacing the o2 sensor?
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Old 04-21-2014, 11:43 PM   #9
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I'd search YouTube my self. They are all the same. Mine lasted forever so no advice other than what I would do.
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Old 04-22-2014, 02:49 AM   #10
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Anyone know of any good write ups regarding replacing the o2 sensor?

I didn't need any write ups on it...Just verify which one it is. There's 2...1 is on the down pipe just passed the exhaust manifold ( easy to get to) and the other is on the catalytic converter. They can be a bitch...especially if they're still original or if they were last replaced without using the compound on the threads that comes with them. I couldn't get either one of them off myself, even with putting all of my 240 lbs on it. I do suggest having a shop do these for you.
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Old 04-22-2014, 04:54 AM   #11
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Anyone know of any good write ups regarding replacing the o2 sensor?
Not that hard to do. An O2 socket with a breaker bar should do the trick. You should have 4 sensors. 2 upstream & 2 downstream. Do some google-ating to find out the sensor location. Be sure to replace with OEM NTK sensors. Rockauto has the best price last time I looked.
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Old 04-22-2014, 07:44 AM   #12
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Anyone know of any good write ups regarding replacing the o2 sensor?
I would suggest letting the Jeep run for a few minutes to heat up the pipe. Don't burn yourself, but it will make it easier to remove a rusted in sensor. The heat cycles can make them get stuck. I don't use an "O2 Sensor Wrench" if I know that I'm replacing the sensor. I'll just cut the wires and use a deep well socket. Let me know if you have any other questions!

-Ryan
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Old 04-22-2014, 11:37 AM   #13
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Not that hard to do. An O2 socket with a breaker bar should do the trick. You should have 4 sensors. 2 upstream & 2 downstream. Do some google-ating to find out the sensor location. Be sure to replace with OEM NTK sensors. Rockauto has the best price last time I looked.
I think Rockauto always has the best prices!

Bank 1 Sensor 2 is the first sensor you come to after to pass the mini cat correct?
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Old 04-22-2014, 02:27 PM   #14
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Click image for larger version

Name:	image-1991523368.jpg
Views:	55
Size:	161.3 KB
ID:	1016417

Am I looking in the right place?
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Old 04-22-2014, 07:26 PM   #15
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yes. all 4 are in your pic
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Old 04-23-2014, 01:11 AM   #16
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Ok thanks
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Old 04-24-2014, 05:03 PM   #17
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Attachment 1016417

Am I looking in the right place?
Okay guys, $88 bucks later and both error code are gone. Changed the bottom left sensor and it cured both codes.

Now to decide what i will spend the cash I saved on since I did it myself!
Trek Armor seat covers or Truck Lites????
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Old 04-24-2014, 05:17 PM   #18
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How hard was it to get out? Congrats.
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Old 04-24-2014, 05:20 PM   #19
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How hard was it to get out? Congrats.
Not hard at all. There is plenty of room to work with down there. It took about 15-20 minutes.

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