FRKWOO

i had a recent y7 to y8 motor swap in my ek with 00 ex wire harness. i had a local shop known for honda motor swaps to hook the wire harness up for me and when they were done they said the secondary o2 outlet was missing and all i needed to do was get a p28 ecu and jumper harness and convert to obd1. i wanna keep obd2 and just want to add the second o2 back on. i need help on which part of the wire harness the secondary o2 snesor goes i have another cut outlet and o2 sensor ready to go.

20civic0000si

The second O2 comes off the Car harness in the EX/SI and off of the engine harness in the rest of the civics. Just depends on which engine harness and header you are using.

If your using the Stock harness w/the stock header which is what it sounds like you are using, then you have to add a second O2 bung and a Jpipe and run the wires to the factory Secondary plug.

If your using the Y8 engine harness your still going to need a Jpipe but just run the wires to the ECU.

FRKWOO

im running megan 4-2-1 headers with stock 00 civic ex harness in my 00 ek

redline7070

the second O2 **** out of the floor to the cat

FRKWOO

im talkin about where do i connect the connector outlet for the o2 sensor to the engine wire harness

redline7070

you have to run new wires to it or put a ex/si floor harness in. on the ex/si the 2nd o2 is on the floor harness at the shift

FRKWOO

can you put in more detailed form if possible?

redline7070

hondahookup.com hasthe service manual you can get it on page 2187 has the 2nd os
http://www.hondahookup.com/manuals/