Before I installed the Invidia with built in CEL eliminator I was getting a code for the secondary 02 and running rich. After the install of the Invidia and a different 02 sensor I was only getting a bad 02 CEL.

I changed the 02 sensor one more time. The light was off for a day then the CEL came back on.

One day later the CEL turned itself off. It has been off for about three days now. Maybe the ECU readjusted itself. When I installed the new 02 I did disconnect the battery for about 2 minutes. It should of reset at that time.

What do you guys think is going on. I am just happy I don't have a CEL anymore.

One last thing. I am getting an occasional hiccup/hesitation. Happens a lot at low rpms but sometimes it will hiccup for a second while cruising at about 55mph. I am not getting any misfire codes and the last compression test was good. Is this just heatbog? Can a valve adjustment cure some of this?

Thanks