SOHC Civic. On my secondary 02 sensor, one wire grounds it, one drives it, one is for the 02 heater, but I can't figure out what the fourth one is for. I need to know because I had to wire one straight from the ECU. My HELMS tells what three of the four are for my secondary (red/white, green/black, white/black) but the fourth wire from the sensor is black/yellow and I can't figure out where it goes. I really don't feel like guessing with electrical stuff. Three of the four are wired and I need to know this ASAP. TIA!!!!

 

2 are for the heater

just read your post and the colors

what year civic is it?

email me and i'll give u the wiring if it's a 96-00 civic


[Modified by rbf351, 11:25 AM 12/30/2002]

 

So I can wire the two heater wires together coming from the sensor, connect them to the one wire coming from the ecu, and it will work fine and I won't throw any codes?

 

i emailed you the wiring, if u need any help let me know