I have a check engine light on my car. I check it out and it was the O2 sensor. Well, my 96 honda civic HB have two O2 sensor. Do I have to change both of them or just one. One is on the header and one is on the cat?? which one do i have to change??

 

what codes is it?

 

i dont really know. My friend used a diagnose computer to check it out. Yeah, I have two O2's sensor in my 96 honda civic HB. One on the header and the CAT.

 

I would just change both of then NTK O2 sensor. why? because if 1 goes out, the other one with sometime soon. there about $70/ piece.well thats what i get em for with my discount

 

correction get NTK O2 sensor or if you got chedder, get one from honda. More reliable but then again they break your pockets.. hope this helps

 

Find out which sensor needs to be replaced with that same scan tool. Sensor 1 is the sensor in the exhaust manifold and sensor 2 is the sensor in the cat. There is no reason to go and buy two sensor when only one is broken.