So I got myself a 4-wire O2 sensor finally, but....

[slick]

Got it off of WidGS, he had it sitting around from when he's done other downpipes. Anyways, question is, what color is what? I know 2 of them are grounds, one is from the actual O2 line, and the other is for the 12V Ignition. Anyone with a newer manual, much appreciated if you could look that up.

 

Thanks.

[OldSkoolGP]

The 4-wire is a heated O2 sensor. You have heater power, heater ground, signal, and signal ground. IIRC, purple is the signal. I tried to run a 4-wire in my one wire setu once, it worked for crap, went back to one wire.

[slick]

Yep, figured out the purple is the signal, now just gotta figure out which is power.

 

Guess I'll have to just test that with my extra battery.

[99RegalGS]

Red = heater power, Black = Ground, Purple = signal

[slick]

The colors on my pigtail harness are:

 

Purple= which I am assuming is signal

Tan=?

Brown=?

Brown=?

 

 

I am assuming the browns are grounds, and the tan is the heater power.

[Jcrow]

Let us know how it works

[slick]

Welp, heading down to the basement right now to test it out.

[Pabz]

multi-meter that,

 

ground to ground should be 0hms, no???

 

Heater element to ground should be high omhs.

[pwmin]

i assume thats correct...you shall see

[slick]

multi-meter that,

 

ground to ground should be 0hms, no???

 

Heater element to ground should be high omhs.

 

Should be, and I like your way of thinking. I kinda got sidetracked by working on another project(see General section), but I'm going to test this right now!

 

Thanks!

[99RegalGS]

yes, I'd assume that tan is for the heater. and black for the grounds. DO not try to ohm out the signal wire to anything. I can kill the sensor that way.

[joey b]

what is the significance of this 4 wire sensor?

[Rocketman]

4 Wire O2 sensors have an internal heater that brings the sensor up to operating temp before the engine is warmed up. So its functional well before a single wire O2 sensor is.

[WildGS]

My guess is the two brown wires are the heater, Purple is the signal and tan is the signal ground. HTH

 

 

This would be the plug on the car so the O@ sensor has the male end this is the female end.