O2 Sensor

[joshellis]

Hi

I'm having a helluva time getting through CA smog. After reading posts I am attempting to replace the o2 sensor. Here is the the one I just removed from the truck (located down from the y-pipe next to the gearbox on driver side)

 

Heres the new one I ordered

Here is where I bought it

 

 

My questions:

1. The 3 wire connector is the same, but what is the second connector on the original sensor for? In the engine bay it looks like it is woven into the harness.

 

2. The replacement sender is a larger size thread of course. Can I plug the current hole and drill & tap a new hole somewhere else? If so, where is the best location? I know there is a thread on this but I couldnt find it sorry.

 

3. The replacement has the same three piece connector but only a short cable. To extend it, how do I match the universal white-white-black wires with the harness connector red-white-blacks wires?

 

4. Can you test these things for malfunction somehow? I'm getting less mpg than I should if thats any indication.

 

 

Here are my CO readings:

 

MAX AVE MEAS

15mph 0.84 0.14 1.26

25mph 1.03 0.12 1.05

 

Everything else it passed.

 

Thanks v much for the input,

[MY1PATH]

wrong year or model or something, go back and get the sensor with 2 plugs. I think it has to do with being a "heated o2 sensor"

[RedPath88]

I've been told that you can just splice the three wire into a four wire system, but there are mixed results doing it, as I understand.

 

I ordered a direct replacement from www.oxygensensors.com

[94extreme]

mine sure only has one plug.. the wire is long and the sensor was the same exact size.. take red's advice and get the right one.

[RedPath88]

Yeah I am pretty sure that you got a sensor meant for a VG30e (MPFI) while your truck has a VG30i (TBI).

[94extreme]

long wire on my MPFI too. i think it's the same sensor throughout all the wd21 years.

[joshellis]

Interesting stuff thanks

 

I removed the protective sleeve from the the factory one, the thin single plug wire is spliced into the main black wire from sensor, hmmm.

 

So the wiring of the two sensors is the same.

[joshellis]

So is the single connector a 'terminator' ??