Alright. I just put a 4-1 header on my 00 sohc 1.6L. I hooked up both o2 sensors. And now my check engine light is on. Since I am not using a cat. Should I remove the 2nd o2 sensor? The car still runs, but now has a slight miss due to running rich. Any ideas of how to fix this problem?

 

The secondary O2 sensor will not cause your motor to run rich. If you have the primary O2 sensor not hooked up right, then it will cause you to run rich if throwing the code.

Check the codes...

 

both are hooked up correct. I was told I might not be able to use both O2 sensors. Is the a way to eliminate the sencondary sensor?