i just noticed the other day, that there are two 02 sensors right at the collector part of the stock SiR exhaust manifold. apparently, one hasn't been hooked up since i got the car, and it still gets good gas milage, so whats the deal?

am in the process of making a downpipe and need to know if i need two 02 bungs?

thanks.

 

Maybe one was for a wideband.

 

no they are stock on the manifold like that. also, the two wires going to them have factory looking harnesses, i already thought if someone taped or added one, but i dont think that was possible. ill post pics.

 

It must have been added on by somebody else because the OBDII B16's are the only ones that have two O2's, but the secondary O2 is in the cat, and the OBD0/I have only one O2.

 

hmm I always thought obd0 b16a's had two o2's also. Mine didn't come with the exhaust manifold so I dont really know.

 

man im confused, could the stock mani could have come off of something different? i am going to post pics.

 

One O2 monitors cylinders 1 & 3, the other monitors 2 & 4 (or 1 & 4/ 2 & 3, can't remember). It is the correct stock manifold for your OBD0 B16.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EE_Chris &raquo;</TD></TR><TR><TD CLASS="quote">One O2 monitors cylinders 1 & 3, the other monitors 2 & 4 (or 1 & 4/ 2 & 3, can't remember). It is the correct stock manifold for your OBD0 B16.</TD></TR></TABLE>

that sounds right, it seemed like that was the case with two on the collector.


anyways, what happens when one isn't hooked up?


becuase i had one only hooked up for a while and it seems ok, and gas mileage is around 30 mpg highway.

bout 23 rippin' on it


thanks.

 

Is your ecu chipped? if so it it only looks at one o2.

 

obd0 b16a1 has two o2 sensors... not sure what ECU you have (like asked above) but mine wouldn't allow me to drive the crx with only one o2 attached...

(EDM CRX 1.6i-VT... all of that bone stock from the factory)

 

for the cars that have two O2's..

the second one is to tell if the cat is working correctly..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Outsane &raquo;</TD></TR><TR><TD CLASS="quote">for the cars that have two O2's..

the second one is to tell if the cat is working correctly..</TD></TR></TABLE>

You're talking about OBD2 ECUs - we're talking about OBD0 ECUs.