I have a 00 civic Ex. Will a si o2 sensor work if it the same year?? Anyone have the part number for the primary heated o2 sensor for 00 civic??

 

Yes, it should work. They both should be the same 4 wire sensor even though Honda gives different part numbers. And the only difference between the primary and secondary is length of wire leads. They are actually interchangeable.

And if you need a new OEM sensor check out this auction. http://cgi.ebay.com/ebaymotors...95048

I got a brand new OEM sensor for my SI from him a couple weeks ago.