my car is 96-99 model civic EX four door 1.6
I got CEL and the problem is primier oxygen sensor, I am thinking to change that one,
All the model detail I can read from my old oxygen sensor are:

-------------
NS6
Denso
234000-2180
04B18
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my sensor is with heating function.
but the models I can see in Amazon are Denso 234-9010, 234 9007, 234-9025,234-4011. Not sure which one I should use for replacement.
Is there any expert tell me this? Thanks a lot!

 

www.densoproducts.com and many other sites say your Civic's primary is Denso 234-4099. You can google further and maybe find it $5-$10 cheaper. Not sure why the old one has a number that does not match up anywhere.

Since you're in Canada, I would call densoproducts.com and confirm there is not something different about the O2 sensors required up there.