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Unread 07-20-2010, 02:36 PM   #1
JarrettJones
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1998 TJ Wrangler 
 
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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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Unread 07-20-2010, 10:42 PM   #2
JarrettJones
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Come on guys i need some advice please.
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Unread 07-20-2010, 10:43 PM   #3
88blkyj
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google the codes
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Unread 07-20-2010, 11:03 PM   #4
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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Unread 07-21-2010, 06:34 AM   #5
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.
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Unread 07-21-2010, 06:52 AM   #6
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.
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Unread 07-21-2010, 11:30 AM   #7
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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