NCCivicNoob

Hello, my inspection was due October and I couldnt get it due to outrageous tint laws. I finally had time to take it off today and on my way to the inspection center, My engine light comes on. Got the reading, its the Oxygen Sensor, upstream. I really dont know what that is, but nevertheless, I got a price for the part: $250! I dont know if there is a cheap fix i could Do It Myself, or do I have to suck it up and get it done through a mechanic. Ill take any opinion at this point and Doing it myself would be nice, if I can. Thanks!

ezone

Anything can be DIY if you have the right equipment.

The hex on an O2 sensor is 7/8 inch.
Upstream is first in the exhaust stream, the sensor closest to the cylinder head.

Aetoc

iTrader: (1)

Yea, the OEM sensor is gonna be that expensive, but replacing it is pretty much just a matter of unplugging the old sensor and unbolting it from the exhaust, then doing the opposite with the new one.

04 Honda Civic

iTrader: (2)

EX or LX?

Buy a quality one or you WILL be doing it over.

NCCivicNoob

Hello guys! Thanks for the input, and it was all helpful. I went searching for alternatives to this predicament and tried various things before buying the part. I checked the sensor for any loose or frayed wires. They were good. Then I went to the fuse box (inside the car under the steering wheel, second fuse, 20A) and pulled it out and found it good. When I cranked my car up though, the engine check light was off! So I didnt have to buy anything and it passed inspection! I hope I could help anyone that has this problem in the near future! Thanks for replying again!

em2maxamillian

I had the same experience with my upstream O2 sensor, and $250 was around the price I paid for a Denso brand, which I think is the brand Honda uses in their cars anyway. Just a word of caution: keep an eye out for that CEL. My O2 sensor problem was intermittent; meaning that the light would stay off for a few days, come on again, then go off again for a few more days.

04 Honda Civic

iTrader: (2)

I dont think that means your out of the woods just yet, perhaps you pulling the fuse made it reset.

Only time will tell. Good luck.

NCCivicNoob

Thanks for the replies! As for the code, it was showing that there was no conductivity between the sensor and the computer, which I guess means that sometimes it does not get current. Yes the check engine light does still come on every now and then but it always finds a way to turn itself off. I guess I won't switch it until I get a reading that it does not sense an actual flow not conductivity.