90 civic hatch threw a code 1, I replaced the O2 sensor and cleared the ecu. Next day it threw the code one again. Checked all the wiring and none are broken. Wth....

 

Ok so I'm getting no power from the O2 sensor plug! I don't see any breaks in the wiring at all. Where do I go from here????

 

Seriously! Nobody??? I really don't know what I'm looking for any testing this stuff is the wire that comes from the harness that plugs into the O2 sensor supposed to be hot as in I really don't know what I'm looking for any testing this stuff is the wire that comes from the harness that plugs into the O2 sensor supposed to be hot as in 12 V

 

 

Thank you!!!

 

OK so I did everything that that post told me to do and everything checks out my wiring is good the O2 sensor check out and my computer is good and and I'm still getting the code one what do OK so I did everything that that post told me to do and everything checks out my wiring is good the O2 sensor check out and my computer is good and and I'm still getting the code one what do I do now and I'm stumped

 

So you did the very last step?

 

Yes I checked wiring all the way back to the ECU and it seemed they were fine I've been put in another computer and when I got on the highway code popped up again! I'm at my wits end.The replacement 02 sensor is a bosch and I heard they were garbage, but it seemed to test OK

 

Are you running an aftermarket header?

 

Yes

 

I pulled the O2 sensor out and it was covered in black soot

 

So I put another O2 sensor in it and now it's coming on every 3 to 4 days.I am seriously at my wits end with this thing I don't get it

 

I had the same issue with my 91 lx and replacing 02 seemed to fix it. Did you use a cheap autozone brand? This is the one I used...

 

You know, an O2 code doesn't necessarily mean the O2 is bad. It can also be that the O2 is getting exhaust readings that are so bad that the O2 sensor goes out of range on the readings.

Having tons of black soot on your O2 sensor is not a good thing. Maybe you have internal engine issues giving an improper burn of fuel or something.

Does your exhaust smoke at all?
Have a look at your spark plugs and lets see what those look like.
Do a compression check while you have all the plugs out.