Hi all,

My gauge kit says the following for simulating narrowband with a wideband in place of the upstream:

Green - Narrow band analog output (narrow band simulator). Connect to the
appropriate wire on factory 02 harness to prevent check engine light if this sensor
has replaced a factory sensor.


Am I supposed to splice or connect this green wire to one of the wires from the upstream o2 harness in the pic below that sits next to the map sensor? And would that connector just sit there connected to nothing since the wideband sensor has it’s own wiring harness? If so, how do I go about finding out which wire from the factory harness should be spliced with the green wire from the kit? If not, what am I getting wrong? Thanks for the help

 

I just found what I pasted below in a Miata forum and this makes more sense to me. I read somewhere on here before that the black wire on the o2 sensor is the signal wire. Can anyone confirm this and how do I test for that for my own learning experience?

Wideband in factory bung, splice simulated narrowband signal wire into the factory O2 sensor signal wire at the plug.

I'd cut the OEM O2 signal wire off right at the sensor. Use whatever length of the wire from the plug as needed to connect it to the WB simulated NB signal wire.
This way there is no modifications to the car's factory harness. It's all done on the side that unplugs.

One word of caution on the OEM sensor, be careful where you put it. The sensor will heat up and it gets hot. You need to attach it to something that will tolerate the heat. I'd use a metal screw type hose clamp to secure it.

 

Did you get this working properly?

I looked into this a month ago and came away with the impression that it couldn't be done. I thought that was strange, since it works on my Mustang (but I have an aftermarket computer there).

Let me know how it works!

 

I haven’t tried it yet, but I’m thinking I might just have a bung welded. I’m afraid of a poor weld job. That’s why I’ve been considering this alternative, but if I have to keep the factory sensor in the engine bay and it gets as hot as it does, I’m not too happy about that. Could be more of a problem than it’s worth, and it makes me wonder what happens to the IAT with a live o2 sensor in the bay.