Hondata

Ah just saw this too:

The Civic HX and all 2004-2005 Civics use a wideband 02 sensor compatible with the K-Pro

I've researched as much as I could on options for o2 sensors. I've read anywhere from "02-04 RSX ONLY" to "match the o2 to the ECU" to "all 02-04 use the same o2" to "the 05 si works". Some of that even came from Hondata admin.

I'm currently running K-Pro on a 2003 Civic D17a2. The ECU is a 2002 ...