Thread: Regrounding the O2 Sensor

OK, I got my 4 wire O2 sensor. Does it matter which order the two white wires are wired? MY O2 harness is black, blue black.
SO I can use the black to the blue and the two white to any of the black wires? And the grey exclusively to the ground?

As we have learned with Nissan's colors mean nothing! Be careful here!

Alright on the 4 Wire O2 sensor here is the wire codes:

Black: Signal
Grey: Ground
White: Heater Signal/ground
White: Heater Signal/ground

The Heater (white) wire doesn't have polarity so it doesn't matter which way you hook them up.

But be very careful with the Black and Grey.

That would be correct Ian. Im assuming that when you say "O2 harness" that you mean the harness connector cut from your old O2 sensor.

Signal Connection: Black wire (from the 4-wire O2) - to - Blue Harness wire
Heater Connections: 2 white wires - to - 2 black harness wires (either one; none polar)
Ground Wire: Grey wire - to - NEW Ground wire connected to one of the Intake Mani Rear grounding screws.

Done. When I first hooked it up, the car felt sluggish. Feels a little better now. I just wanna watch the fuel economy.

Reset the ECU

Yeah, I even got a bog in the rpms that actually was not there before. I will reset the ECU by clearing the codes with the ECU switch.

Bogging is not good...

Recheck all of your connections!! Tug on all connections to make sure they are tight.
Something is not right.. Make sure you are NOT throwing a O2 CEL...

For all plugs disconnected during this mod install, Unplug & reconnect all of those connections.

I was originally hoping that this mod would fix the bogging on our cars.. Well, it doesnt fix the bogging but improves the bogging problem. So if you now have a NEW bogging issue, something is definitely wrong (not plugged in, loose connection, etc).. Please Recheck your install.

I do not like the box connector that Bosch supplied. (push in and screw type) Can I use butt connectors instead? I will recheck.

Yes, you can use the butt connectors but at least use the ones with shrink tubing to seal the connection from oil & dirt.

The Bosch connector kit/box is well built and the best protection against heat, dirt, water, & vibrations. Its a pain to tighten those connectors (especially with large fingers like me), but take your time & use small needle nose pliers to help tighten them.

Butt Connector will work but can deteriorate over time (from oil, dirt, salt, & vibrations).
Bosch Connector is best..

OK, sticking with the box connector. Man I want some wings with hot sauce and ketchup.