Dual O2 On a B16a????? WTF????
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From: The Woods
Dual O2 On a B16a????? WTF????
Ok I just picked up this clean EF9 with a 1st gen JDM B16a, I noticed that it has 2 1 wire o2 sensors at the collector?????? does anyone know why??????
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From: stevens point, WI, 54481
Re: Dual O2 On a B16a????? WTF???? (Go n 4 10s)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Go n 4 10s »</TD></TR><TR><TD CLASS="quote">Ok I just picked up this clean EF9 with a 1st gen JDM B16a, I noticed that it has 2 1 wire o2 sensors at the collector?????? does anyone know why??????</TD></TR></TABLE>
Because that was the way that honda intended it to be.
Because that was the way that honda intended it to be.
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From: Severn, MD
Re: Dual O2 On a B16a????? WTF???? (snowseeker)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by snowseeker »</TD></TR><TR><TD CLASS="quote">Because that was the way that honda intended it to be.</TD></TR></TABLE>
This is the correct answer. 1 O2 monitors two cylinders while the 2nd monitors the other two.
This is the correct answer. 1 O2 monitors two cylinders while the 2nd monitors the other two.
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From: Severn, MD
Re: Dual O2 On a B16a????? WTF???? (rice is nice)
Because it's not the way this particular ECU was setup. You'll notice it's a first gen B16 and that current day they don't use this O2 sensor arrangement anymore.
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From: Severn, MD
Re: Dual O2 On a B16a????? WTF???? (rice is nice)
My guess would be better fuel control...or what they (Honda engineers) thought would be better fuel control. Go the reverse - what do you think might happen if we had an O2 sensor PER cylinder? The ECU could then monitor fueling needs on a per cylinder basis and adjust on a per cylinder basis. But that seems overly complicated and costly for a consumer car. So trying one O2 sensor per pair of cylinders seems like a compromise in performance/cost. So as time went on, technology and methods changed for engineering emissions friendly automobiles and thus we've arrived at having a single O2 sensor monitoring all 4 cylinders.
Again, just guessing.
Again, just guessing.
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From: Armonk, NY, USA
Re: Dual O2 On a B16a????? WTF???? (EE_Chris)
The way they did it a few years ago (I don't know if they do it now) was to have one o2 sensor in front of the cat and one behind the cat. This way, if both o2 sensors showed the same reading--you would know that the cat wasn't doing anything and was therefore useless and needs replacement. It was a way to make sure the emissions system was operating 100% which is important to the government.
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