c00ker

Hey guys,

I posted last week about replacing a 4-wire upstream o2 sensor on my '05 HX with a generic and I have to splice the wires together. The generic has: black / white / grey / white. The OEM was: black / black / green / white.

Those should be in order clockwise.

Does anyone know which wires should match?

Thanks!

It Wasn't Me

The connector can only go on one way.

So, lay both of them next to each other and wire them accordingly, clockwise, from top-left to bottom-left, one wire at a time, so that the all wires end up in the correct terminals.



Not sure why it won't just plug in, though. Did you literally just get whichever generic sensor was the least expensive?

c00ker

Hey sorry I wasn't clear - I got the generic o2 sensor that fits but doesn't come with the plug on the end. So I just need to make sure that the wires match up.

honda.lioness

If you have not figured it out yet, here is what I would use:

Generic's two whites = OEM's two blacks = sensor's heater wires
Generic's black = OEM's white
Generic's grey = OEM's green

Per:
https://honda-tech.com/forums/tech-misc-15/universal-4-wire-o2-sensor-question-537221/

https://honda-tech.com/forums/acura-integra-6/anyone-wire-universal-o2-sensor-2621877/#post39526718

http://importsnc.com/forums/car-tech...nsor-help.html

http://www.aa1car.com/library/o2sensor.htm (scroll down to chart)

It Wasn't Me

Thanks for taking the time to look that up, Elle.

honda.lioness

You're welcome. I was too lazy to do it the first time I saw the OP's post. Folks did not jump in with an answer the way I thought they would.

fiveten

that year and trim uses a A/F sensor for the primary B1S1 sensor. (Bank 1 Sensor 1) if you bought a universal O2 sensor with 4 wires it wont work. You need a new A/F sensor.

honda.lioness

I see what you are getting at now. An A/F sensor is the newer type of sensor; it is wide band. For older Hondas, the front oxygen sensors are narrow range. If all the online stores labeled their sensors as either wide range or narrow range, that would be great. But searching autopartwarehouse.com turns up what looks like the correct (wide range) Denso sensor. It is not advertised as an a/f sensor yet from comparing it with other online stores, it is. One finds the same problem at the Bosch web site: Bosch does not call its wide range sensor an a/f sensor but it is in fact one.

Both the wide and narrow range sensors are 4-wire for the 2005 HX.

I think the lesson is that if one wants to try a universal sensor, one way or another confirm it is the wide range design.

c00ker

Hey guys I spliced the new O2 sensor in and now I'm getting code P2252 - low voltage oxygen sensor.

Is it possible it's just a bad splice or is this just not right? According to autopartswarehouse it's supposed to work.

It starts better now and doesn't have the engine problems it had before...

It Wasn't Me

P2252 - Air Fuel Ratio Sensor (sensor 1) AFS - Terminal Low Voltage

Probably a bad connection. For schnitzengiggles, you can do the following if you'd like.

Start by resetting the ECU by removing fuse #6 (15amp) from the fuse box under the hood. Wait at least 15 seconds before re-installing it, then start the engine.

Does the MIL come back on? If not, it was an intermittent failure. Check the connections to make sure they're good both at the sensor, and at the ECU.
If it did come back on, turn the engine off and disconnect the oxygen sensor, and also disconnect the 31-pin ECU connector. (connector A)
Check to see if there's any continuity between terminal A16 (red/yellow) and a ground. If there is continuity, you have a short between the sensor and A16. You'll need to locate it and fix it.
If there's no continuity, something's up with that sensor. It's either wired wrong, has a bad connection somewhere along the line, or it's faulty and needs to be replaced.




Another possibility is that the ECU itself is bunk.

c00ker

Just in case - here's the o2 sensor I purchased last week:

http://www.autopartswarehouse.com/sk...%26+Drivetrain


The first code I got was P2A00 when my car was experiencing problems. Replaced it with this sensor, now it seems to drive/start fine, but I'm getting this new code...

I'll take a look at the connections but wouldn't mind some more input from others. Thanks!

honda.lioness

Try what It Wasn't Me suggests. But be ready to buy an OEM sensor, too. I noticed that, while the aftermarket site from which you purchased your sensor says this sensor is good on all submodels of Civic from 1998-2005, the oem parts site bkhondaparts.com gives different part numbers for the 2005 HX and 2005 LX oxygen (a/f in the case of the 01-05 Civics) sensors.

Here are a couple of threads that do not mirror the fine reviews at autopartswarehouse.com

http://www.civicforums.com/forums/36...d-ii-code.html

http://www.clubxb.com/forums/f67/tro...des-25757.html

Hopefully you can return the aftermarket sensor if you cannot get it to work without throwing a code.

theineffable

anyone know why honda switched to an a/f sensor? were there any significant gains in using an a/f sensor? i think the fuel economy and HP specs stayed the same from 01-05?

honda.lioness

http://www.autoshop101.com/forms/h37.pdf seems to describe the differences well. The design differences seem rather large. E.g. "The A/F sensor voltage output is the opposite of what happens in the narrow range oxygen sensor."

All car manufacturers are obliged to keep emissions down yada, so I suppose this is what drove the switch by Honda and many (all?) car manufacturers for 2001 (or so) and later models. Anecdotally, I know my 1.7L, 2003 Civic LX gets the same or better mileage as my old 1.5L, 1991 Civic. I imagine one reason is the (wider range) a/f sensor.

I see that, for at least some 98 Civic sub-models, the oem parts sites call the front sensor an "oxygen sensor," and it is supposed to work in 1993-2000 Civic submodels. Yet the autopartswarehouse.com site implies its universal sensor works as both an a/f sensor and a more conventional oxygen sensor. This does not make sense to me.

I do not know what is with the 83 positive reviews of this sensor at the latter site. I do see the three reviews at the site for Civics are all for pre-2001 Civics.

Things are not adding up. I am now suspicious of the autopartswarehouse.com sensor, unfortunately for the OP and I bet a lot of shoppers at autopartswarehouse.

c00ker

Ok guys I was able to send the O2 sensor back for a refund.

What's a good replacement wideband sensor? As long as it works and won't crap out in 2 weeks is all I'm really concerned about.

Thanks!

honda.lioness

It appears even the Bosch wide range sensors go for at least $100. The one sensor at autopartswarehouse.com that is wide range for the 2005 Civic HX goes for over $200. All I am finding at other aftermarket sites that is wide range are (usually well!) over $100.

theineffable

you can buy an oem replacement wideband a/f sensor from rockauto.com for approx. $120-$150shipped. it will be a wideband sensor w/ oem connector. they have various manufacturers to choose from (I'd pick the Bosch or Denso one).