PO 141 and PO 138 - JeepForum.com

 
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post #1 of 7 Old 07-20-2010, 02:36 PM Thread Starter
JarrettJones
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PO 141 and PO 138(O2 Sensors)

Well i threw A check engine light the other day about 100 miles out of nashville. I got the codes read today and they came out to be PO141 and PO138. Some research told me these were the O2 sensors. But before i replace them i want Jeepforums take on what i should do. Which code is which o2 sensor? And I know i should avoid Boshe sensors, so what do yall recommend im on a very tight budget.


Last edited by JarrettJones; 07-20-2010 at 10:42 PM. Reason: Try get replys
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post #2 of 7 Old 07-20-2010, 10:42 PM Thread Starter
JarrettJones
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Come on guys i need some advice please.
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post #3 of 7 Old 07-20-2010, 10:43 PM
88blkyj
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google the codes
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post #4 of 7 Old 07-20-2010, 11:03 PM Thread Starter
JarrettJones
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I have, but im not making heads or tails of the actual problem. I dont know how the heater circuit works on the 98 TJ and im having trouble finding any information relative to my model.
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post #5 of 7 Old 07-21-2010, 06:34 AM
cj847
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Both codes are related to the rear O2 sensor behind the cat. Check your wiring to make sure you don't have a short. Then, erase the codes and see if they come back. If they come back, I'd replace the rear O2 sensor as it may have an internal short.

97 TJ Sport OPJ project (other peoples junk) I can't remember the last time I bought a new part.
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post #6 of 7 Old 07-21-2010, 06:52 AM
Sundowner
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Also, check the fuse/relay under the hood. I had five parts stores and three dealerships swear to me that I needed three new O2 sensors...turned out it was a blown fuse.

If it's worth doing, then it's worth overdoing.

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post #7 of 7 Old 07-21-2010, 11:30 AM Thread Starter
JarrettJones
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Quote:
Originally Posted by Sundowner View Post
Also, check the fuse/relay under the hood. I had five parts stores and three dealerships swear to me that I needed three new O2 sensors...turned out it was a blown fuse.
Whish fuse is it in the PCM? Also i need to get a NTK or OEM O2 sensor right?
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P0141 , P0138 , 02 sensor , oxygen sensor

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