Thread: Regrounding the O2 Sensor

Yep.. Rock Auto is correctly listing the correct parts for a OEM setup..

Your car is no longer OEM after installing the SSAC Header.

The grounding properties has been diminished b/c we changed from Steel to Stainless.

Think of this as a O2 MOD for cars with stainless steel headers!
Similar to the MAF Grounding Mod!!
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YES!!!! another "MOD" i can add to my sweet custom ride yo!

But seriously Rock does list both as 4-wire, thats why i was confused.

Just took a look at RockAuto.... And their listing is all screwed..

If you pull up the 93 NX 2.0 or Sentra SER 2.0/Emissions/Oxygen Sensor:
- it lists 15726 as a 3-wire heated sensor .... Correctly

But, if you pull up the 98 or 99 Sentra/2.0/Emissions/Oxygen Sensor:
- it lists 15726 as a 4-wire heated sensor .... Incorrectly

I actually have a new Bosch 15726 O2 Sensor!!
It is a 3-Wire sensor....

Thats so strange.... But the listing is wrong...
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Man this thread keeps going back and forward. Are you still doing a write up with PICS, or will there be testing needed?

Dude, I hope that we havent been misleading here..
We are still testing this and do not have provable results yet..
Any mods performed at this time is still only preliminary at this point!
And hopefully more people will participate in our efforts here...

O2 Signal Results using Exhaust Grounds:
- After applying the grounding straps: Signal improved during 1st two weeks and then drop off suddenly.. Unknown reason but long term improvements were not gained. Failed
- Using a heavy gauge wire and attaching to a ring around the header O2 bung: Signal fluctuated due to vibrations and improvements were very minimal. Tacked it in-place with very minimum improvements. Failed

O2 Signal Results using 4-wire O2 sensors
- Tried a few Ebay 4-wire sensors. Sensors were not model 15727 sensors and ebay dealer could not identify the exact model number.
Vadium tryed these sensors on his 99 Sentra (ODBII) with some mpg improvements. Partly Passed
But on my 93 NX (ODBI), the sensor did NOT work as the Voltage was too high with one and too low with another. Failed

- SkyShepard in Post #140 installed a real 15727 sensor from RockAuto on his 91 NX2000 (ODBI). His preliminary results showed success. The level of improvements is unknown and hopefully he will post on-going improvements. Passed

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Last Friday, I finally ordered a real the Bosch 15727. I will install and start testing this weekend.

Once I monitor performance over a 2-4 week testing period and its successful, I will post a HowTo with pics (pictures will only show the grounding to the Intake Mani). I will also try to estimate the expected level of improvements for this mod.

We are not going back and forth on this... Tests are failing as noted above and we are going back to the drawing board trying other things.

Hopefully, this is saving other forum members the frustration and saving them from wasting money/time installing stuff that dont work ! ! !

BOTTOM LINE
We simply dont have a defendative solution with provable results yet..
Our latest approach using the real 4-wire O2 sensor 15727 appears promising but Im not willing to say this works completely yet...
We are trying to improve MPGs, improve idle, and hopefully improve bogging at low RPMs.
If we fix only one of these, I will consider the time & effort a success.
You are always welcome to offer other suggestions or provide your test results.
But the FAT LADY is still on the stool and she aint freaking singing...
Sorry...
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I meant back and forth from a debate point of view. Nice to see this being done though. Keep up the good work. I did some tuning and my gas mileage has gotten better by the way.

Sounds like the ground from the O2 being able to hold a positive reading at a certain voltage and saying at that reading is what is being tested. Along with that, getting better gas mileage, idling, and NO bogging. I have not been mislead. I was just chiming into the thread because my O2 sensor needs to be replace soon. I haven't done anything to my O2 thus far.

Scotty --

I'm looking forward to seeing your results with the 15727.

Bill

Haha I know, I'm just picking on him, Sentrixx and I go pretty far back



Haha Either Scotty or I will post a How To thread, I already have most of the pics, just need to do the writing

^Sounds great. I hope we have a winning setup soon .

We understand that people want to start applying this mod soon. And you can. Just be aware that results are not proven yet and that the 4-wire mod will not hurt anything (if you wire it up correctly).

But if you do install the 4-wire 15727, please post your results with:
- year/model, gas mileage gains, and idle improvements
- Also if you have experienced bogging, post if the new O2 sensor improved the problem.
- Please also post updates after 2-3 weeks of driving with the same information (ECU learning mode takes time to reestablish).



Thanks Bill. As you know, this has been an ongoing problem for me and I will post the details of improvements found.
This gremin is very evasive bugger.
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