O2 sensor plug color

[Zach Baumann]

I have a fresh rebuilt engine and I’m battling o2 codes. I’m wondering if anyone has a picture or knows what side of the car the blue or green o2 plugs in the harness go to?

Thanks for the help

 

[TexasBlownV8]

Uh, that's going to cause you all kinds of issues if you do that!
The green ones are upstream, go up front ahead of the cats.
The blue ones are downstream, in or after the cats.
It makes a difference which connectors you plug into which side, too; most important is to get the green ones plugged into the proper connectors as you engine will run like crap if connected wrong. The blue ones will not affect the engine running, but can also be hooked up backwards (crossed) if not careful; you'd only get p0420 and 430 codes if those were wrong, if the fronts were right.

For the front/green ones, look at the colors of the wires on the engine-harness-side connectors; the one with a red/white and gray/lightblue is passenger side green, while the red/black and yellow/lightblue is driver front; both will also have a red/yellow and gray/red, common to both sides.
For the rear/blue connectors, passenger side has white/black and red/light-green; driver side rea has violet/light-green and tan/yellow.

 

[Zach Baumann]

Thank you so much!!

 

[JC SSP]

This forum rocks!

I think you owe him a cold beer! LOL

 

[Zach Baumann]

I most definitely do owe him a beer