b16 o2 sensor question

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New Member
Hey guys, I have an Eg hatch with a b16a2 swap. Recently my o2 sensor crapped out on me and while I was under the car replacing it I noticed it has the 5 wire sensor instead of the 4 wire. Now as I've been reading that the wires should've been converted to a 4 wire set up in order for the b16 to work... Soooo how's it working?? lol I'm going to try and clean the sensor that was in there and hope for the best but I'm not sure how the thing ever got in to closed loop with the 5 wire sensor... Or is the conversion not done to the harness but to the ECU?