I'm looking at the plug with 2 black, 1 white, and 1 green....the white and the green go to the sensor+and-......how can I tell which black is which? Thanks!...again this is for a 1999 Accord OBD-2.....I just wanted to add the 2 black, when looking at the O2 plug, are at the top near the retaining clip.




Modified by 1990hondaHF at 11:41 AM 2/28/2005

 

The 2 black heater wires shouldn't matter which is which.