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Thread: HOW: Most OBD II: Remove the Rear O2 Sensor

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Posts: 1-10 of 98
2008-04-25 05:39:31
#1
HOW: Most OBD II: Remove the Rear O2 Sensor
How to Remove the Rear O2 Sensor and CEL


Note this should work for most OBDII cars. This mod was done on a 1999 Nissan Sentra, 98 200sx's should have a very similar process. As for earlier yeared cars, you will have to test and see for yourself


This is for off-road use only. Do this at your own risk!

Parts Needed

All parts numbers below are Radio Shack Part #'s.

Just the Sensor Delete (Not the Whole O2 Sensor)
  • Knife
  • Soldering Iron
  • Electrical Tape or Heat Shrink
  • 1x 1µF (micro-farad) Capacitor (I used Part # 272-1434) - Picture
  • 1x 1-Megohm Resistor 1/4 Watt - 5% tolerance (I used Part # 271-1356) - Picture


Steps - Just the Sensor Delete

You would have to use this method if you have a fully working heater part of the O2 Sensor. The O2 Sensor will still need to be connected

1. Remove the O2 Sensor from the CAT and unplug it from the harness

This should be the diagram for this installation, Note Blue wire is equal to Black, and white is equal to Gray.


You can do it two ways, you can solder the resistors inline with the sensor, or you can just seperate the signal and ground wires. I will show pictures of the latter method

4. Solder the 1µF (micro-farad) Capacitor from the Black wire to the Gray wire



5. Solder a 1-Megohm Resistor right after the Capacitor, from Black Signal wire and Gray Ground wire.


6. shield everything off and your all set


7. Connect it and screw it into your CAT or hide it elsewhere.

Steps - Complete O2 Sensor Removal

I tried to do the complete sensor removal, but the heater wires cause a problem

Here is what happened:

Last edited by Vadim on 2013-01-17 at 03-20-48.
2008-04-25 15:10:29
#2
Real nice writeup!!

The double outside insulation wrap should holdup very well over time!
2008-04-25 15:31:49
#3
Thanks Scotty!

I hope so haha
2008-04-26 05:02:57
#4
im thinking about doing this, but for the 01 se. damn light has been on for around 2 years. might give it a shot. thing is though, is that i remember you doing this, and then the other o2 sensor went out the first time. whats different this time around?
2008-04-26 05:17:52
#5
Originally Posted by chiquae07
im thinking about doing this, but for the 01 se. damn light has been on for around 2 years. might give it a shot. thing is though, is that i remember you doing this, and then the other o2 sensor went out the first time. whats different this time around?


Haha well the first time I didn't use a strong enough of a resister for the heater element. I used a little tiny 1/2 watt one that almost burned my car down and burned a fuse that caused the front O2 sensor Heater to not work either haha.

This is why I used 4 10 watt resistors, thus making this device huge but safer
2008-04-26 05:40:37
#6
like, i see this picture, but i dont understand where the o2 sensor 'oem flange' connectes to the ecu to disconnect it like the maf, and just leave the old o2 in the rusted bung by cutting off those wires. my question is where is that 'oem connecter' located? by the ecu box or...

http://i160.photobucket.com/albums/t188/covertrussian/Sentra%20SE-L/Maintenance/Rear%20O2%20Delete/CIMG0516.jpg
2008-04-26 06:01:41
#7
Originally Posted by chiquae07
like, i see this picture, but i dont understand where the o2 sensor 'oem flange' connectes to the ecu to disconnect it like the maf, and just leave the old o2 in the rusted bung by cutting off those wires. my question is where is that 'oem connecter' located? by the ecu box or...

http://i160.photobucket.com/albums/t188/covertrussian/Sentra%20SE-L/Maintenance/Rear%20O2%20Delete/CIMG0516.jpg


OEM connector is found in this hole on B14's, not sure about B15's but take a look

2008-04-26 14:59:05
#8
haha ghetto but super creative!
2008-04-26 16:44:14
#9
how much would sell me one this done already??
2008-04-26 18:00:31
#10
Originally Posted by 2dr_sentra
haha ghetto but super creative!


Haha it works, so thats all that matters to me!

Originally Posted by SGTSR20
how much would sell me one this done already??


Well parts alone come out to be $10ish plus work so probably $20ish. Only thing is it is illegal to sell these (this is why you can't find them on eBay anymore), and the time it takes to do it... which I don't have too much of with my wedding coming up soon.

It's really easy to make, just takes a little time and patience
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