rquad

Can anyone identify the electrical connector below? It hangs off the 4L60E on the passenger side, just back of the bellhousing...





This is on a factory LS2/4L60E combo (GTO) with the full factory wiring harness. There were three other connectors on the harness that went to the tranny, but I didn't see anything for this one.

mille_3

iTrader: (1)

That looks like an o2 sensor plug

oldgoat69

Agreed, should be another on the other side, maybe not in the trans harness.

EFIHARNESS

Yes, it is an O2 sensor connector. Steve

rquad

Well, that's interesting because there are two other connectors (one on each side) that are orange/black, have four leads, but are inline instead of square. I thought these were the O2 sensors since there is one on each side. What are the orange/black connectors if the blue/white is O2.

rquad

Alright, so never mind on the above question. I search RockAuto for GTO parts, and now I see that this setup has two each of upstream and downstream O2 sensors. The square ones are the upstream and the black/orange ones are the downstream.

So, now the question becomes which ones do I tune out? I assume I get rid of the upstream?

nicke

Nope, you get rid of the downstream, which only verify operation of the cats.

-Nick

Oscar Will

...what Nick said

gofastwclass

iTrader: (2)

The rear O2 sensors will be listed in the software as "Bank 1, sensor 2" and "Bank 2, sensor 2."

rquad

Awesome.

I hope the O2 sensors come with some long cords. Those upstream connectors are pretty far away from the bungs at the end of my long tube headers.

superdave84

You can buy extended adapters that lengthen them. No need to cut or splice anything, just plug in both ends and you're done.

EFIHARNESS

all of the above answers are correct. One more thing, be sure you connect bank 1 sensor 1 to the odd side,and bank 2 sensor 1 to the even side, If backwards you will have problems. Steve

rquad

You guys are great. Tons of info. Just what I needed.