[savageevo]

I have a question concerning the O2 sensor. Say you have a k20a in a eg with kpro, I guess you can delete the secondary O2 sensor after the original cat, but I was told that you do not need the primary O2 sensor either. I thought you need the primary O2 sensor for normal drivability. thanks

 

[uncivic4dr]

yes keep the primary o2 sensor, or get a wide band o2 from aem that is even
better.