Just checking to see if anyone else is popping a CEL ("unexpected oxygen difference") on their Berk 63mm HFC. I ran it for about 2500 miles just fine until the CEL came on. The code was as stated, so I had it reset. Came back on 140 miles later - same code. It has been suggested that my best option is to swap the HFC for the OEM cat shortly before I get smogged (Oregon - data port only), then swap it back out for the HFC for the next 2 yrs until it is time to get smogged again. I thought the Berk HFC was supposed to pass smog, but I won't get anywhere with a CEL on.

I am running the GReddy kit on my DBW '06 with Hondata's Flashpro. Thoughts?

 

You try one of those CEL eliminator things used for testpipes first.

Did you update the flashpro to the latest software?
I remember a thread not too long ago about a software issue on the o2 CEL issue. (If i remember correctly)

or the cheapest way would be just to turn it off completely via flashpro unless you need it for emissions.

Also I know you have the Berk HFC but another issue that MY06+ guys had with Asura HFCs were that the opening for the o2 was covered for some reason.. I drilled mine out and havent had a problem since.