O2 sensor orientation

[Falconvan]

Looking at the PCM pinout for a 94 it shows wires for O2 sensors #1and#2. Which one goes to which cylinder bank or does it matter? I'm assuming #1 is for cylinders 1, 2, and 3?

 

[kevinspann]

Should be that way. Bank 1 would be 1,2,3 which is the rear bank when the engine was installed in the car. Bank 2 is 4,5,6. That's all of the o2s , no downstream. The ATX shos also used heated o2s.

 

[Falconvan]

Great, thanks, Kevin.