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PO135, PO141, and PO155 Any Ideas?

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Old 12-09-2008, 11:08 PM   #1
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PO135, PO141, and PO155 Any Ideas?

So while running some errands the check engine light comes on. Truck was running fine so I finished my errands and went home. When I got home I plugged in my code reader and I get all three codes listed above. When I checked the live engine data the O2 sensors seem to be functioning normally. Anyone ever see something like this? is there a fuse on the O2 heater circuit that could have blown? The truck is a stock 03' extended cab ZQ8 with a 4.3L Auto.
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Old 12-10-2008, 11:03 AM   #2
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Re: PO135, PO141, and PO155 Any Ideas?

What is your temp. gauge reading? Could be a bad CTS (Coolant Temp. Sensor).
Old 12-10-2008, 11:32 AM   #3
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Re: PO135, PO141, and PO155 Any Ideas?

Quote: Originally Posted by Yogi
What is your temp. gauge reading? Could be a bad CTS (Coolant Temp. Sensor).
The gauge reading was 210. I assume that is normal for a stock truck. Is there a second temp sensor that sends info to the PCM? I know on other vehicles the gauge reading is not what the PCM reads.
Old 12-10-2008, 11:40 AM   #4
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Re: PO135, PO141, and PO155 Any Ideas?

Quote: Originally Posted by jhall4721
The gauge reading was 210. I assume that is normal for a stock truck. Is there a second temp sensor that sends info to the PCM? I know on other vehicles the gauge reading is not what the PCM reads.
GM used to do it that way. Starting in about '96 or '98 they went to one sensor. PCM reads sensor and PCM sends sensor reading to the gauge.

Try resetting your PCM and see if the codes go away.
Old 12-10-2008, 11:09 PM   #5
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Re: PO135, PO141, and PO155 Any Ideas?

So the fuse that powers the O2 sensors was blown. I replaced it but I imagine it will blow again. Hopefully it will just be a bad sensor heater. I'll dig into it more this weekend.
Old 03-23-2009, 04:25 PM   #6
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Re: PO135, PO141, and PO155 Any Ideas?

Sorry to bring up an older topic, but I guess that's what the "search" is used for.

Anyways, I've been running with PO155 for a little while and was curious to know how I can go abouts correcting the problem. Should I just replace the o2 sensor and be done with it? What fuse could I possibly replace to correct the problem?

Any help would be great...Thanks
Old 03-25-2009, 11:14 AM   #7
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Re: PO135, PO141, and PO155 Any Ideas?

Well if you are only getting the one code I would say the heater in the O2 sensor is bad and the sensor will have to be replaced. You can check the fuse in the fuse box under the hood but I was showing all three codes simultaneously. I knew there was little chance of having all three heaters go bad or the wiring short for all three heaters so I checked the fuse. In your case you could swap the offending sensor with one of the other 3 in the truck and see if the code changes. If it does then you know the sensor is bad. If you have a chilton or Hyanes book on the truck it will tell you how to check the heater coil in the snesor without removing it.
Old 03-25-2009, 12:25 PM   #8
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Re: PO135, PO141, and PO155 Any Ideas?

Quote: Originally Posted by Yogi
GM used to do it that way. Starting in about '96 or '98 they went to one sensor. PCM reads sensor and PCM sends sensor reading to the gauge.

Try resetting your PCM and see if the codes go away.

I have a 97 and it has two sensors for coolant, one is related with the thermostat while opening and closing, and the other is for the pcm. I got mine at napa for 30 bucks or so a piece..
Old 05-20-2012, 09:20 PM   #9
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Re: PO135, PO141, and PO155 Any Ideas?

i have been having a similar problem as the op. I keep getting the po141 code so i replaced the o2 sensor and cleared the code with my scan tool from work and after about a day of driving it is back on??? Does this mean maybe my o2 harness might have a fault in it?

Thanks in advance for any and all responses!
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