rear Oxygen Sensor Wiring questions - JeepForum.com

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post #1 of 32 Old 11-04-2013, 08:33 PM Thread Starter
roadcruzer
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rear Oxygen Sensor Wiring questions

Just purchase another Jeep for my son, 98 Grand Cherokee. It looks like the wires got ripped apart on the rear 02 sensor behind converter, I am guessing by the rear drive shaft ?? and I do not know which wires go where being the colors do not match. someone worked on this before. It looks like the sensor is relatively new. I was hoping one of you could help out.
This is what I have:
on 02 sensor (behind converter) 2 white wires, 1 black and 1 gray.

on wire harness: 1 green with red strip, 1 black with yellow strip, 1 black with green strip and 1 black with red strip.

Anyone have any idea which wires go where? IT WOULD BE A BLESSING!

Pleasssssse Help!

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post #2 of 32 Old 11-04-2013, 09:15 PM
ZeeJay1997
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Clean the wires up and recheck the colors.

Black to Black /pink - 1 black with red strip
Grey to Black/light blue - 1 black with green strip
White to Dark Green/Orange - 1 green with red strip
White to Black/Tan - 1 black with yellow strip





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post #3 of 32 Old 11-05-2013, 03:21 AM
Speedymcracer01
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Mine is showing a blck/ orange wire this one goes to your powertrain control module. Orange/ dark blue goes to your fuel pump relay.its showing the black/ tan is a ground to z12. Splice, then black/ light blue is a ground to k4, splice. My o2 got caught on my zj's drive shaft before it blew my pcm fuse in the pdc under the hood. All I did was tape the wires up real tight and tucked the o2 wiring harness behind the heat shield. Mine has the four wires also. So that means it's the heated o2 sensor. My wire to the o2 that preheats the sensor is not working properly anymore causing it the spit and sputter for just a moment after that first crank up after the jeep has cooled down. After just a couple seconds after crank up the o2 heats up then she runs perfectly fine
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post #4 of 32 Old 11-05-2013, 05:34 AM
ZeeJay1997
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Quote:
Originally Posted by Speedymcracer01 View Post
Mine is showing a blck/ orange wire this one goes to your powertrain control module. Orange/ dark blue goes to your fuel pump relay.its showing the black/ tan is a ground to z12. Splice, then black/ light blue is a ground to k4, splice. My o2 got caught on my zj's drive shaft before it blew my pcm fuse in the pdc under the hood. All I did was tape the wires up real tight and tucked the o2 wiring harness behind the heat shield. Mine has the four wires also. So that means it's the heated o2 sensor. My wire to the o2 that preheats the sensor is not working properly anymore causing it the spit and sputter for just a moment after that first crank up after the jeep has cooled down. After just a couple seconds after crank up the o2 heats up then she runs perfectly fine
wrong diagram. that's for an OBD1


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post #5 of 32 Old 11-05-2013, 06:15 AM
Speedymcracer01
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Well **** that's messed up in my book it's saying that was for 98 and earlier models
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post #6 of 32 Old 11-05-2013, 02:25 PM Thread Starter
roadcruzer
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o2 wiring

Quote:
Originally Posted by Speedymcracer01 View Post
Mine is showing a blck/ orange wire this one goes to your powertrain control module. Orange/ dark blue goes to your fuel pump relay.its showing the black/ tan is a ground to z12. Splice, then black/ light blue is a ground to k4, splice. My o2 got caught on my zj's drive shaft before it blew my pcm fuse in the pdc under the hood. All I did was tape the wires up real tight and tucked the o2 wiring harness behind the heat shield. Mine has the four wires also. So that means it's the heated o2 sensor. My wire to the o2 that preheats the sensor is not working properly anymore causing it the spit and sputter for just a moment after that first crank up after the jeep has cooled down. After just a couple seconds after crank up the o2 heats up then she runs perfectly fine
Doesn't that affect your mileage a lot?
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post #7 of 32 Old 11-05-2013, 02:31 PM Thread Starter
roadcruzer
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Quote:
Originally Posted by Speedymcracer01 View Post
Well **** that's messed up in my book it's saying that was for 98 and earlier models
So this not the correct diagram or directions? So what happens if I do hook up the wires wrong? Will if burn anything up electrical wise or just still give me the code?
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post #8 of 32 Old 11-05-2013, 03:26 PM
JS97ZJ
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That is the correct diagram.
Speedy mc has the old system (pre 96).
96-98 is OBDII compliant. The down stream o2 monitors the condition of the cat. and has very little to do with fuel efficacy. You might see a 1 mpg decrease with the wires ripped out.

The replacement # is Mopar 05013971AA and you can find it on the web for a variety of prices.

I've seen them for as low as $14..... Here's one....http://www.ebay.com/itm/NEW-OEM-PART...-/360713827431
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post #9 of 32 Old 11-05-2013, 03:43 PM Thread Starter
roadcruzer
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Quote:
Originally Posted by JS97ZJ View Post
That is the correct diagram.
Speedy mc has the old system (pre 96).
96-98 is OBDII compliant. The down stream o2 monitors the condition of the cat. and has very little to do with fuel efficacy. You might see a 1 mpg decrease with the wires ripped out.

The replacement # is Mopar 05013971AA and you can find it on the web for a variety of prices.

I've seen them for as low as $14..... Here's one....http://www.ebay.com/itm/NEW-OEM-PART...-/360713827431
SO that being said, do you know which colors hook to which colors that i have?

02 sensor (behind converter) 2 white wires, 1 black and 1 gray.

on wire harness: 1 green with red strip, 1 black with yellow strip, 1 black with green strip and 1 black with red strip
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post #10 of 32 Old 11-05-2013, 03:46 PM Thread Starter
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O2 sensor

Quote:
Originally Posted by JS97ZJ View Post
That is the correct diagram.
Speedy mc has the old system (pre 96).
96-98 is OBDII compliant. The down stream o2 monitors the condition of the cat. and has very little to do with fuel efficacy. You might see a 1 mpg decrease with the wires ripped out.

The replacement # is Mopar 05013971AA and you can find it on the web for a variety of prices.

I've seen them for as low as $14..... Here's one....http://www.ebay.com/itm/NEW-OEM-PART...-/360713827431
I have also read on other forums that with a bad O2 sensor it can make your fuel mixture incorrect and engine starves for fuel and bogs at higher speeds with barely any acceleration. What's your thoughts on that?
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post #11 of 32 Old 11-05-2013, 03:48 PM Thread Starter
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Quote:
Originally Posted by roadcruzer View Post
I have also read on other forums that with a bad O2 sensor it can make your fuel mixture incorrect and engine starves for fuel and bogs at higher speeds with barely any acceleration. What's your thoughts on that?
.
I think my sensor is good , it looks pretty new, it's just that wires are ripped off of harness and colors do not match to hook back up.
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post #12 of 32 Old 11-05-2013, 03:56 PM
zjosh93
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Quote:
Originally Posted by roadcruzer View Post
SO that being said, do you know which colors hook to which colors that i have?

02 sensor (behind converter) 2 white wires, 1 black and 1 gray.

on wire harness: 1 green with red strip, 1 black with yellow strip, 1 black with green strip and 1 black with red strip
ZeeJay already gave you the O2 sensor to factory wire colors:

"Black to Black /pink - 1 black with red strip
Grey to Black/light blue - 1 black with green strip
White to Dark Green/Orange - 1 green with red strip
White to Black/Tan - 1 black with yellow strip"
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post #13 of 32 Old 11-05-2013, 04:04 PM
JS97ZJ
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I haven't replaced mine as of yet, and it tore off in the spring. That bogging down and poor acceleration is due to the upstream sensor going bad.
A bad upstream will also cause back firing and take out your cat very, very quickly.

It also might be that the colors are weathered. The diagram I posted is from the 98 manual and my 97 (hard copy) manual concurs with it.
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post #14 of 32 Old 11-05-2013, 06:49 PM
ZeeJay1997
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Quote:
Originally Posted by roadcruzer View Post
So what happens if I do hook up the wires wrong?
it could blow the PCM in a heartbeat. see first post i made for correct wiring. double check the colors. post back what you find.

If it were mine, i would order a connector (thanks JS) and an NTK o2 sensor and fix it right.


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post #15 of 32 Old 11-06-2013, 01:51 PM Thread Starter
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02 Sensor

Quote:
Originally Posted by ZeeJay1997 View Post
it could blow the PCM in a heartbeat. see first post i made for correct wiring. double check the colors. post back what you find.

If it were mine, i would order a connector (thanks JS) and an NTK o2 sensor and fix it right.
I will check the colors again and hook up if I am confident but if you are talking blowing out my PCM, I will either order wiring kit and sensor as you said or try it without it hooked up as Zeejay1997 and JS97ZJU stated he did with little difference.
Last night I had cut off the old exhaust behind CAT to install new and behold someone had gutted the Catalytic Converter out. I am not sure if or how this could affect the 02 sensor being gutted.
Do you really think I would need to have this 02 sensor hooked up? What differences do you think it actually would make now?
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