hi guy i did a B16a2 99 Honda civic si engine into my 99 Ek
i have fix all the problem but 1 i cant seem to wire up my second behind the cat 02 sensor plug the Ek Wire harness has the second O2 sensor in the wire harness but the Si Wire Harness only has one and its for the before cat O2 sensor. so in other words the 99-00 civic Si has 2 O2 sensor but one is built into the car and is inside the interior of the car hooked up to the ecu. and for me doing this swap into a ek i dont have a built in one so i need to wire one into my ecu and i was wondering if anyone out their has done this swap and can send me a diagram of how to wire up this second behind the cat O2 sensor. its only 4 wire but its a troubling 4 wire if anyone can help please post some pictures up they would help alot