o2 sensor issue and others too

[velorossa]

I have a 96 legacy 2.2L with the check engine light on. It usually will stay off for a couple days then come on and the code will say bank 1 below threshold, which I assumed to be 02 sensor not working correctly. I replaced it but it came on the same as before. When I replaced it there was 1 black wire and 2 white wires that I couldn't tell the difference between. Could I have missed that one and hooked up the 2 whites backwards? Also how can a person test the o2 sensor for working correctly and is the a easier to get to connector where I can test it.

Also I have an intermittent rough idle when warming up. Runs fine right at start up (I'm assuming cold start valve is working) but after a few seconds it idles around 300-400rpm making the car shake a little. Once warm it idles closer to 600-800 and feels better. I've heard it could be fuel pressure regulator. Is there a way to test it. I have a diagnostic fuel pressure gauge, so if the needle is sticky will the pressure read different at idle cold vs warm?

If there is a loose body ground could it cause an electrical discharge ( like static shock) when getting out of the car and closing the door?

Thanks for your help guys!

Nate

[idosubaru]

nate, your vehicle has two O2 sensors. which one did you replace, the front one i assume?

 

definitely check your wiring. to your question "could i have switched wires" i will say "yes".

 

O2 sensors are Subaru only preferred items by some, but based on some details i am not thinking that is your issue here.

 

as for the idling problem, i would clean the idle control mechanism. they get clogged and sticky with age/time. very common and easy to fix. just clean it out. though i haven't done it to an EJ vehicle yet so i'm not sure where it is.