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Unread 09-28-2009, 07:34 AM   #1
SilverGT
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2004 KJ Liberty 
 
Join Date: Sep 2009
Location: Tonanwada,NY
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Where is the O2 sensor fuse!? P0038 Code? Need help Resolving..

I just replaced the o2 sensor on my liberty the one that was throwing a P0137 Code..after installing the sensor i disconnected the battery for a reset of the check engine light. it went away for 20miles then came back but there is no codes to be pulled from the check engine light when i try the on/off/on/off/on method.

From what i have been reading it might be a resistor inside the ecu or a o2 sensor fuse...
Where is the o2 sensor fuse located? can anyone give me some insight.


Last edited by SilverGT; 09-29-2009 at 06:20 AM..
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Unread 09-28-2009, 10:58 PM   #2
richd
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You still have a problem with you O2 sensor curcuit.PO038=HO2S Heater Curcuit High Voltage Bank 1 Sensor 2.I would look for a broken or burnt wire.
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Unread 09-29-2009, 05:58 AM   #3
SilverGT
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Yea rich. Its the weirdest thing. The check engine light was on, I used a scantron. Tired to pull the code, the scantron said PASS with no code but check engine light was still on.

So I erase the code, then 20miles later the check engine light came back on with still no code....I'm stumped.
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Unread 09-29-2009, 01:28 PM   #4
richd
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That is strange,the computer should pick that up with the CEL on.You did have that PO038,so I would still double check the wiring.
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Unread 09-29-2009, 01:40 PM   #5
SilverGT
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Quote:
Originally Posted by richd View Post
That is strange,the computer should pick that up with the CEL on.You did have that PO038,so I would still double check the wiring.
yea its the weirdest thing...i will check the wiring tonight but do you happen to know where the fuse is for this o2 sensor is? someone said there was a o2 sensor fuse somewhere.

upon further exam, i noticed the old o2 sensor had the wire zip tied to a brake line..looks like previous o2 sensor shorted itself on the exhaust at one point in its lifetime.
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Unread 09-29-2009, 01:52 PM   #6
richd
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I have a 08KK,and my manual shows no fuse for O2s.I think you found your problem.Good Luck,and let us know.
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Unread 09-29-2009, 02:05 PM   #7
SilverGT
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Quote:
Originally Posted by richd View Post
I have a 08KK,and my manual shows no fuse for O2s.I think you found your problem.Good Luck,and let us know.
this was before I replaced that old 02 sensor with a new one. So I'm thinking the ecu is bad if there is no fuses for the o2 sensor.

When it shorted itself did it short out the ecu also?.
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Unread 09-29-2009, 05:25 PM   #8
richd
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Not sure about ECU.I would find the problem,clear the computer,and see if the code comes back.
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Unread 09-30-2009, 06:37 AM   #9
SilverGT
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I just got it scanned and the code P0420 came up. im assuming its the cat gone bad? should i put a non-fouler in and call it a done deal?
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Unread 09-30-2009, 11:55 AM   #10
richd
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No.If you have a bad cat,its going to plug up your exhaust,and you wont have any power,second,you in NY and wont pass inspection.You cant have any code for inspection.
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Unread 09-30-2009, 12:03 PM   #11
SilverGT
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its doesn seem to have power lost... and the p0137 code went away now it has the p0420 code. does it still mean the cat is no good? how can i check to see if the cat is plugged?
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Unread 09-30-2009, 12:11 PM   #12
richd
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You can check them with a tempertaure sensor gun.Ive heard most muffler shops have a free check.The O2 sensor must have been bad for awhile.
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