Which o2 sensor is which? b16sir into ef/si

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freak86

New Member
In the middle of a swap, and I took the two o2 sensors off because I didn't want them to get damaged as I was putting the manifold/downpipe back onto the engine. Now, I can't remember which one goes into 1&4, and which one goes into 2&3. You would think it wouldn't matter, but each one goes to a different pin on the pr3 ecu, so I would think the ecu knows which one should be on 1&4 and which one should be on 2&3. It does matter which one goes where, does it not?
 
yes it matters.

pin c8 goes to o2 B
pin c16 foes to o2 A
 

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which pinout on a p30 ecu is for a second o2 sensor? i have to run one but i dont know which pinout to run it to
 
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