Say for instance i have a aftermarket header for a old school B16A for a crx as example. Say it only has one bung hole for one O2 sensor, could you run 1 O2 sensor only and would it be fine?. If you cannot, then is it possible to splice the two O2 sensors together to run into 1 O2 sensor on the header's one bung hole itself?. I already tryed search but could not find enough detail, if their is anyway to do this with one o2 sensor then let me know and thanks in advance guys.

 

One way with a stock ecu is to weld both bungs in the correct location.
Another way is to get your ecu chipped so it doesn't require the O2 sensors.
Another way is to convert to OBD-1 then the 02 bung is in the correct location.


Don't wire both sensor inputs to 1 O2 sensor.
See here:
http://www.hondata.com/techclosed.html
https://honda-tech.com/zerothread?id=700889

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Contender25 &raquo;</TD></TR><TR><TD CLASS="quote">Say for instance i have a aftermarket header for a old school B16A for a crx as example. Say it only has one bung hole for one O2 sensor, could you run 1 O2 sensor only and would it be fine?. If you cannot, then is it possible to splice the two O2 sensors together to run into 1 O2 sensor on the header's one bung hole itself?. I already tryed search but could not find enough detail, if their is anyway to do this with one o2 sensor then let me know and thanks in advance guys.</TD></TR></TABLE>

I think the other sensor goes after the cat.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by YasRex &raquo;</TD></TR><TR><TD CLASS="quote">

I think the other sensor goes after the cat. </TD></TR></TABLE>

That is for a ODB-1 configuration.


For OBD-0, see this:
https://honda-tech.com/zerothread?id=900501

 

You can use 1 o2 but you will get shitty gas mileage and either run too rich or to lean.Each o2 sensor reads a pair of cylinders that's why you need both, otherwise on an aftermarket header it will read all 4 at once and the ecu won't give proper air to fuel mixture.Hasport make a header for that swap with both o2's but it's kind of pricey.Ifyou have a 4-2-1 header just get them welded in the right spot,but it has to be 4-2-1 a 4-1 won't work.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mar778c &raquo;</TD></TR><TR><TD CLASS="quote">

That is for a ODB-1 configuration.


</TD></TR></TABLE>

Actually its 0bd-2, obd-1 uses 1 heated O2 sensor.

If u need to run only 1 O2 for the time being, you could. For long term usage, u should really run both.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fourthgenhatchB17 &raquo;</TD></TR><TR><TD CLASS="quote">Actually its 0bd-2, obd-1 uses 1 heated O2 sensor.

If u need to run only 1 O2 for the time being, you could. For long term usage, u should really run both.</TD></TR></TABLE>

I'd definately run both! Messed up mixtures are not a good thing for reliability and they *will* reduce engine power drastically.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fourthgenhatchB17 &raquo;</TD></TR><TR><TD CLASS="quote">

Actually its 0bd-2, obd-1 uses 1 heated O2 sensor.

If u need to run only 1 O2 for the time being, you could. For long term usage, u should really run both.</TD></TR></TABLE>

Thanks for the clarification.

Also, I'm glad people are finally agreeing with that 1 O2 sensor for OBD-0 is a bad deal.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mar778c &raquo;</TD></TR><TR><TD CLASS="quote">One way with a stock ecu is to weld both bungs in the correct location.
Another way is to get your ecu chipped so it doesn't require the O2 sensors.
Another way is to convert to OBD-1 then the 02 bung is in the correct location.

</TD></TR></TABLE>


You can follow any one of my suggestions and be trouble free.

 

So basically i HAVE to run two O2 sensors on the obd0 b16a just because it's obd0?, or because it's in a obd0 CAR?.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Contender25 &raquo;</TD></TR><TR><TD CLASS="quote">So basically i HAVE to run two O2 sensors on the obd0 b16a just because it's obd0?, or because it's in a obd0 CAR?. </TD></TR></TABLE>

It depends on what ecu you're running. OBD-0 PR3 or PW0 unchipped needs 2 O2's.

 

I know this has been answered but I'll put in my two cents. I had mine wired with a jumper at the ecu so the signal from one O2 went to both spots on the ecu that look at O2 voltage. I didn't have any codes but I got about 21mpg and my motor felt weak as hell. It really sucked! The problem is the ecu will be only reading data for two cylinders and if jumpered adjusting fuel for both banks based on the readings for only one bank. My car failed emissions because it was running rich as hell. Have an exhaust shop weld another bung in the right spot. It's worth it in gas money alone!

 

So um...where does the second bung hole go then since im kinda lost?. Like one goes on the header, actually two right?, well if you had aftermarket header with only one, couldn't you just get a second bung hole welded into the exhaust, or would that be a problem compared to using the stock header which has two bungs already?.

 

I had both of my o2's spliced together in a B16a crx. They were spliced into the header. Smelled like **** after a while so I had to un do them and do it into the cat.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fourthgenhatchB17 &raquo;</TD></TR><TR><TD CLASS="quote">

It depends on what ecu you're running. OBD-0 PR3 or PW0 unchipped needs 2 O2's. </TD></TR></TABLE>

yeah thats is correct...

all you need to do is chip ur ecu, and most chipped pr3/pw0 programs run on only 1 o2 sensor

 

For stock positions see here:

https://honda-tech.com/zerothread?id=1155952

For header positions see here:

https://honda-tech.com/zerothread?id=1402454
bottom of the page

 

splice the 2nd from the harness into the 1st

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ExplicitSpeed360 &raquo;</TD></TR><TR><TD CLASS="quote">splice the 2nd from the harness into the 1st </TD></TR></TABLE>

Wow, did you read anything in this post?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ExplicitSpeed360 &raquo;</TD></TR><TR><TD CLASS="quote">splice the 2nd from the harness into the 1st </TD></TR></TABLE>

Yeah seriously did you read what I said above? Don't splice them with a stock ecu. The stock ecu uses the info from two sensors for a reason. The efficiency of these motors has alot to do with the computer controls. When you start screwing with the engines ability to react to it's current condition, you might as well just weld a gas tank to the intake manifold and open a valve and hope enough gas goes to each cylinder.