Set up for 2 O2 sensors?

My 94 G20 has the LO3 and the first time I pulled the doghouse off I noticed a second round single wire connector off the rear engine harness that was the same style as the one for the O2, anyone run into this or know what it is? think the wire was plack.

Might be a brake switch wire. I've seen those on most harnesses I work on, but they're usually purple.

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Originally Posted by Jim_Rockford

My 94 G20 has the LO3 and the first time I pulled the doghouse off I noticed a second round single wire connector off the rear engine harness that was the same style as the one for the O2, anyone run into this or know what it is? think the wire was plack.

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EST connector for setting the timing?

Naa not the EST Its connected and Im changing my intake today and noticed its got a flat blade male end , not round like an o2 so that rules that out.

Does it look like any of the connectors in the photo?

nope. Im not worried, Im probably gonna sell the van and get a 454 crew cab.