Gen1 B16A 2x O2 Sensors ???

[AsH_]

ive read that the first generation B16A has two O2 Sensors where the Gen2 has one.


now i know where there is one O2 Sensor and thats on the bottom end of the Headers, but where is the 2nd one ???

a lot of ppl talk about O2 Sensors but i never realised there were two of em...

[ACTI0NMAN-1]

one is situated on the runners of the exhaust manifold, and the second is just before the cat.

i believe both are single wire o2.

[genkimashi]

Yeap.. so has 2 while some has onli 1 just like mine... at the collector of the header... while those had 2... will be 1 at the side of the header n 1 at the collector of the header....

Cheers

[bennjamin]

all OBD1 cars have 1 O2 sensor , while OBD2 have 2.
It seems OBD0 has 2 , too.

[AsH_]

why is there 2 ???

and others have 1???

like a backup sensor??? or perhaps it avg the figures from 2 points ???

[genkimashi]

Yeap.. if i remember clearly... for eg..ef8 b16a has 2 02sensor...while da6 has 1 onli which at the collector point of the header... probably just the way honda built it... correct me if i'm wrong..

[krovikan]

I have a gen1 b16a, n the sensors r just afta the headers go from 4 to 2.... this was a hassle when i installed type r headers (which i got cheep) n it ended up costing me $250 to modify at Liverpool exhaust

[AsH_]

if i was to install a new headers and exhaust, do i have to have the 2 O2 sensors attached aswell...???

[ACTI0NMAN-1]

from g2ic.com forums

quoated from

hondata:
Early VTEC engines use two oxygen sensors arranged to read one cylinder pair per oxygen sensor. The mixture for each cylinder pair is tuned separately. It is important not to wire the sensors around the wrong way, otherwise one cylinder pair will run lean, and the other pair rich. It is also important not to wire one oxygen sensor into both sensor inputs, otherwise the engine will run either very lean or very rich.

http://pic20.picturetrail.com/VOL1282/4339128/10946969/159117531.jpg

More info is on teamintegra.net
http://www.team-integra.net/forum/display_topic_threads.asp?ForumID=8&TopicID=153650

90DA-Pedro:
You can not tap into the o2 sensor and run the second off the first, in an attempt to trick the ecu into thinking there are two o2 sensors.

The reason for this is each o2 sensor runs Two runners, if this is done two will either run very lean or very rich.

[kyle]

My JDM Ef9 has 3 o2 Sensors, 2 In the header (Above Picture), and 1 in the Cat.

[genkimashi]

wow... did not know tat... thought there were onli 2 max....