1. First to trick the ECU for the sensor circuit.

2. Take the 1M Ohm (that's 1,000,000 Ohms) and the 1uF (micro-farad) capacitor and solder the two together in parallel.

3. You want to work on the harness side that is attached to the O2 sensor (it's easiest). Cut all 4 wires leaving about 2.5-3 inches of wire. You should now be able to remove the harness piece from the car.

4. Strip about an inch of covering off the green and white wires. Solder your two components onto the green and white wires.

5. Tape Everything up and make sure that nothing is shorting against itself.

6. Now we'll eliminate the heater element of the circuit. You'll need a resistor of ~12 Ohms. This heater element flows around 1 Amp of current so you'll need resistors that can dissipate at least 12 Watts of current. Don't scrimp here as under-rated resistors could light your car on fire.

7. Strip the two black wires, solder the resistor in between the two wires. Tape everything well.

8. Plug the O2 harness back into the engine wiring harness

9. You're done.

 

I hope you're referring to the secondary O2 sensor...

If you're referring to the primary O2 sensor, how does the O2 feedback and fuel control of the ECU supposed to work then?

Would definitely not recommend this mod if what you're talking about is for modifying primary O2 sensor.

 

this is a mod that is for the secondary sensor, but if used on the primary will work but once in the higher rpm's your mixture will lean a good amount which will increase hp alot not lean enough for detonation though.

 

Exactly, there would be no feedback to ECU in order to adjsut fuel and spark maps accordingly.

Thanks for clearing it up in regards to which O2 you were referring to though.

 

also I would recommend not touching the resistor after your car has been on, because its going to be really hot..aka heater element. If you want to reduce the temp use 2 10 Ohm 10watt resistors in line that will reduce temps to where they wont burn you and wont melt crap. Also if you want to use a one wire O2 you can just do the heater bypass and attach the white wire to your one wire O2 sensor and tape off the green wire.

 

can you do the one wire conversion to your primary o2 sensor
i know someone that has their b20vtec converted to one wire and i was wondering if this was how they did it

i would really like to know because i am wanting to do this for ease of parts

 

yeah thats what im using now on my primary, yet to be tested for long period of time though I let the car run for like 5 min with the 2 resistors and it worked fine they only got a little warm and ran good no check engine light I need to take it on the street though if you want just wait until I test it more.

 

update: Engine runs great! If you use two it still gets hot but thats not big deal just keep it outta the way or wrap it up lol. I got it inspected, but failed, im certain its my cat, cuz they were no where near as bad as when i tried to pass it last year with no o2 sensor at all lol anyways, this mode is good for those poor asses that cant afford a 4 wire and have and extra 1 wire lying around. In fact I have another 1 wire i'll sell cheap if someone needs it.

 

sweet this is really good to hear
now on to the home made wide band unit

 

I dunno what it looks like and how it works, show me and i'll see what i can do

 

Why the hell would you get rid of the O2?

 

dude secondary and I use it so i can use my one wire instead of a 4 wire

 

i have been getting cel's for the secondary heater FOREVER. if i just did the heater/black wire mod, would it still work?

also, are these parts easy to find, like in a radio shack?

awesome post either way, thanks for sharing.

 

yeah this should fix it, btw yeah you can get it all at radio shack

 

Yo i have a 93 eg cx and i just did a 94 b18c gsr swap. Don't the gsr run 4 wire o2 for the primary? My old harness was using the single wire o2, do i use the single or use a 4 wire?

 

im pretty sure you use the 4, try it and if it doesnt work then you need to fabricate it to work

 

Yo i have a 93 eg cx and i just did a 94 b18c gsr swap. Don't the gsr run 4 wire o2 for the primary? My old harness was using the single wire o2, do i use the single or use a 4 wire?

 

bookmark for later. thanks