I have read 20+ pages of threads here and cannot come up with an answer. I just swapped a 99 b16a2 into a 99 civic dx. I used the b16a2 engine harness and stock B16a2 ecu. All I have left to do is wire up the secondary o2 sensor to the ecu since the wiring for that sensor is in the dash harness of a si. I'm still using the DX dash harness. The o2 sensor I have is wired like this: BLK WHT BLK GRN Can anyone tell me where each wire is supposed to go ino the ECU? I saw a few diagrams but I understand what wires go where. From what I have read (correct me if I'm wrong), the WHT (SO2S) goes to A8, GRN (SHO2SG) goes to A23. I can not find where the BLK wires go. Help please!