i have a b18a1 in my 91 dx, and it keeps throwing a code 1. sometimes i can drive an hour and it wont throw it, then other times it only takes 5 mins of driving. i know its for the oxygen sensor, and i replaced it with a good one, reset the ecu, and it still pops up. well anyways, i used a o2 sensor from another dx civic, and it fit perfectly in where the old one went, looked exactly the same too. any ideas?

im questiong if the header i have is for the ls motor...does the teg header have two holes on the bottom of it, or just 1?

how many wires does the o2 sensor supposed to have on an ls, cauuse i believe the one i put on (dx one) had 1...

is there a second o2 sensor thats supposed to be on my car. i looked on the cat, and i didnt see one, but i think the teg had one there, is there a way to bypass that, or coudl that be causeing my cel to come on because its not there?

oh how do i know if i have a obd-0 or obd-1 motor?? its a pr4 if that helps.