I just bought a 4 wire universal heated o2 sensor on ebay. because i want a heated o2 sensor.

As stated already it has four wires: 1 ground, 1 sensor wire, and 2 wires for the heating circuit.

I thought that i could just ground the ground wire to something, hook the sensor wire to the sensor wire to the ecu and splice the two heater wires in to a 12v source.


My concern is the it will not heat right it i do it this way. I'm not familar with why there are two white wires for the heating circuit. Are they both +, or are the- and +.

has anyone done this before or have any idea if it will work? If so let me know thanks.

 

http://www.v6z24.com/mods/howto/imag...eated/o202.jpg


this is a link showing what the wires are.

So if i slice wire A and C together and ground them to something, hook my signal wire up, and find a +12v and splice that to wire D i think that will work.

anybody else agree?

 

Good thing you dug up that image because putting the two heater wires on the 12v source would have been a bad idea since one is to ground :P Your second post seems like it should work right if the image you linked is right.

 

no no no no no no.

you have a stock narrowband sensor. a heated 4 wire sensor is a wideband sensor that needs a controller to controle it properly.

 

I might have to disagree with this i'm pretty sure it is still a narrow band sensor it just as a heating element to bring the sensor to operating temperature faster than a unheated sensor.

Anyone else agree or is sircygnus right

 

Just make sure you connect that heater to a switched source.

 

4 wire sensors are not wideband.

our stock sensor is a 0-1v output single wire sensor.

 

yeah i will. I forgot to note that.

 

Yeah that's what i always thought. A wideband sends a signal of 0-3v if i remember right, and a narrow is 0-1v like k-tune said.

 

0-5v is a wideband. they have more than 4 wires.

 

I'm interested in why you need a heated o2 sensor. Do you not feel the stock one warms up fast enough? That is the only reason for the heated sensor.

 

I had a heated narrowband 02 sensor for awhile. I ran fused 12V power off of the empty slot in the main fuse box. This went through a relay that was switched via the center wire (B/W?) on the 6-port green test connector (by leading coil). But I eventually removed the whole thing because it was just not necessary. And non-heated 02 sensor replacements are dirt cheap, while the heated versions cost significantly more.

 

compared to 1 wire narrowbands, heated narrowbands are used mostly for emissions. The faster you can heat up that sensor, the sooner you can go into closed loop (front o2 sensor) or detect the efficiency of a cat (rear o2 sensor).

a narrowband is basically a battery. it generates voltage directly, as opposed to a wideband which produces current like a generator. the 4 wires on the narrowband are for signal, ground, and then two unpolarized wires for the heater. widebands are 5 wire. they are WAY more complicated than heated narrowbands and have a much more complicated heater control system.

I've got a bunch of Toyota technician training manuals on this issue I might post up.