ok so i got a o2 extender and when i installed it. It made my car to bug out like crazy when im cruising, I can't even cruise in first gear. does anyone know why that happen.

I have a 97 civic HX (D16Y5)

 

??

 

you reset ecu? mine worked fine. you use in upper or lower bung?

 

you purchased an O2 extender for the 5-wire wideband O2 that'd in your primary O2 location... or a standard four wire extender for the 4-wire O2 that in the secondary location?
(primary = pre-cat, secondary = post cat)