multiple o2 codes

[94redranger]

I have 4 wire O2 sensors my self on my '94 however one of them must have been changed because one is a Bosch and the other is NTK I think and they look different. Anyway does anyone know what colour the O2 output wire is on these sensors?

 

[zedx]

On the RBV's I've seen, it's a strap (not a wire) from the exhaust Y-pipe on the passenger side, to the body behind the wheel well. It's VERY easy to miss if you aren't looking for it, though it's hard to imagine how if you had the Y-pipe yanked for a transmission R/R.

Note that you don't need it -- and it might not be there -- if you have 4-wire oxygen sensors. Those ground through the wiring harness.

I do have the 4 wire sensor. guess that's why I didn't have a ground strap to the exhaust.

 

[zedx]

I did find a black connector on the back of the engine that is disconnected. I couldn't find anywhere that it could connect. the connector is black if that helps, think it was a 2 wire connector.

 

[zedx]

and it is running rich as hell. rechecked the pressure regulator and there is no fuel in the vacuum line.

 

[zedx]

I did find a black connector on the back of the engine that is disconnected. I couldn't find anywhere that it could connect. the connector is black if that helps, think it was a 2 wire connector.

here's a picture of the picture of it.

it is running much better now but still getting the same codes as before from stored memory. both banks rich and lean.