I need to wire in a down stream o2 sensor into my 2002 civc ex engine wire harness becuase i have a dx cabin harness which doesnt have a downstream 02 conector on like the ex would have.

01-03 electrical diagram: http://www.clubcivicquebec.com/HowTo...iagramsEM2.pdf

I would like to wire it into the harness much like the dx/lx engine harness if possible. I have two questions:
1. There are two areas in a civic ecu for the downsteam o2 sensor heater ground and the senors signal wire ( in the E connector(page 15 of diagram) which i believe is only for the ex and in the A connector (page 13) which i believe is only for the dx/lx). My question is are the dx/lx secondary o2 sensor pin outs on an civic ex ecu available to be used or do i need to use the E connector pinouts? i know the answer is seems obvious but i just want to be sure if the E connector is my only option or not.
2. My second question is in reguards to the power source and the signal ground. I want to tap into the the power at j/c c104 and tap into the ground at j/c c103 which are both on top of the cylinder head cover (page 14). Is this possible by just installing a wire into an open spot in each of these?
from what i believe j/c c104 is a 12v source to the sensors and that j/c c103 is the ground for the sensors.

thank you in advance

 

Isn't the DX harness is also wired for two sensors? In that case you just need to extend the wires to reach the new sensor location. Tuner parts stores sell a ready made "sensor extension cable" for just that project.

 

Sorry i did not word what i have clearly enough. I have an ex engine harness which only has a connector for the upstream sensor. It is a dx car so i have no wiring for the downstream sensor since i would have to have an ex cabin harness to have the second connector.