DTCs return need help figurin out what they mean and what to fix

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Ben824

NAXJA Forum User

Location

Woodstock, GA

• Sep 18, 2006

• #1

ok so my check engine light keeps comin on and my scanner keeps returnin 3 codes that i cant figure out what they mean and what i should fix

P0138 - O2 Sensor Circuit High Volts (Bank 1 Sensor 2)

P0135 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)

please if have any clue or ideas as to what these mean please let me know im stumped here

 

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jneary

NAXJA Forum User

Location

springfield, virginia

• Sep 20, 2006

• #2

probably a problem with #1 downstream o2 sensor. ther may be a fuse for the o2 heaters though. i have seen some blown from the wiring contacting the rear driveshaft on some years..hig voltage usualy means an open circuit for that sensro. the pcm doesnt see any of the 5 volts consumed by the sensor therefore it see all 5 volts and sets a high voltage code

 

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Ben824

NAXJA Forum User

Location

Woodstock, GA

• Sep 20, 2006

• #3

i just replaced the #1 O2 sensor last year right after gas prices sky-rocketed i wouldnt think it would have gone bad by now i replaced it with a nice bosch one too but i guess ill check it anyway

 

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jneary

NAXJA Forum User

Location

springfield, virginia

• Sep 20, 2006

• #4

the 97 just has 2 sensors right? i cant remember when the ywent to 4 sensors

 

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Ben824

NAXJA Forum User

Location

Woodstock, GA

• Sep 21, 2006

• #5

the only O2 sensors i can find are the one on the down pipe right below the header and the one in the catylitic converter. if there r any others than that then please someone let me know but i doubt that there are im under that jeep all the time and i havent seen any others

 

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JJacobs

NAXJA Forum User

Location

Fort Collins CO

• Sep 21, 2006

• #6

Those codes mean that the computer is not seeing the expected voltages on the O2 sensors. Whether it's a shorted sensor or two or open/shorted/grounded wires, hard to say from here.

 

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DementedXJ

NAXJA Forum User

Location

Dayton, ohio

• Sep 21, 2006

• #7

Id check the fuse. I had code 138 & 135, found out my wiring on the rear sensor was fubared so i fixed it and i still got the 135 code so me being an idiot spent 164 bux on 2 new O2 sensors. changed em and still got the code so i searched on the net found about the fuse, repalced it and all is well. On my 98 it was inder the hood driver side 15A mini fuse.