PO141 code keeps coming on overnight

Tiny
GREGSAUTOMOTIVE
  • MEMBER
  • 1996 CHEVROLET S-10
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 14,500 MILES
I replaced downstream sensor with boshe sensor then again with nipondenso sensor. You can drive it all day without it coming on but once left overnight light comes on just a few minutes after starting.
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Friday, August 29th, 2014 AT 6:21 AM

10 Replies

Tiny
WRENCHTECH
  • EXPERT
That is a heater code. The first thing you should have done is to test for power and ground arriving at the sensor on the 2 like colored wires.
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Friday, August 29th, 2014 AT 10:38 AM
Tiny
GREGSAUTOMOTIVE
  • MEMBER
A buddy was looking it up online somewhere and this is what he told me abd c what I did. The black wire should be battery voltage and pink wire is ground. This I checked with engine running and checks good.
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Friday, August 29th, 2014 AT 12:18 PM
Tiny
GREGSAUTOMOTIVE
  • MEMBER
Keep in mind every time I do anything with this I have to drive across town so give n e everything in as much detail as you can. As for checking the two other wires that may or may not be like colored. They are not ground or hot.
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Friday, August 29th, 2014 AT 12:21 PM
Tiny
GREGSAUTOMOTIVE
  • MEMBER
Is that your answer? Your answer doesn't make sense to me.
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Friday, August 29th, 2014 AT 12:58 PM
Tiny
WRENCHTECH
  • EXPERT
We have our own jobs and we do this in our spare time.

The pink wire should have 12v with the key on and the black wire should have ground all the time. Test this with the sensor unplugged.
If you don't have any power, check the EGG1 fuse in the engine compartment box.
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Friday, August 29th, 2014 AT 1:06 PM
Tiny
GREGSAUTOMOTIVE
  • MEMBER
It has been a few days since I checked this but I am pretty sure it was black battery voltage and pink was ground. Yes I was checking this with connector pulled at sensor
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Friday, August 29th, 2014 AT 1:14 PM
Tiny
WRENCHTECH
  • EXPERT
No, Pink is power, black is ground.
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Friday, August 29th, 2014 AT 1:55 PM
Tiny
GREGSAUTOMOTIVE
  • MEMBER
Ok I will recheck black and pink wire values at sensor plug and recheck fuses then get back to you.
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Friday, August 29th, 2014 AT 1:59 PM
Tiny
GREGSAUTOMOTIVE
  • MEMBER
Where is primary fuse box location? I have looked under hood and around dash but can only locate a few fuse able links under hood. I know about the box inside door but it does not have egg1 fuse. There has to be another fuse box but it's hidden very good. It's 96 s10 pick up 4.3 engine 2wd
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Saturday, August 30th, 2014 AT 6:48 AM
Tiny
WRENCHTECH
  • EXPERT
That was a typo. That was ENG1

Although they don't seem t be providing any pictures of it, the wiring diagram states it's in the underhood fuse and relay center. It's a 20 amp.

I assume because you are looking for this that you have already tested the harness and found no power.
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Saturday, August 30th, 2014 AT 6:57 AM

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