I drive a 2000 civic EX, will a 2000 civic SI front pre cat oxygen sensor give accurate readings?

 

yes it will work (both just 4wire o2's)

but the harness connector may be different.(there was a thread on this a little while ago)
If that becomes the case just cut the wires and connect the dead o2's end to the newer o2 sensor

 

Hey thanks man, I already had to do that once cause I've got a 92-95 02 sensor on there... If I had known what to search for I would have. Thanks though for not being an *** and actually replying to my thread.

 

ya it works just make sure you plug it into the first plug and not the second one.