Do these have any baring on each other? or are they coincidence that they tripped at the same time?
that would be
code P0440 evap emission system
and P0325 Knock sensor 1 circut (bank 1)

 

I get the same ones, i put a different nissan knock sensor in that i had laying around(prob from one of my sr20's) and cleared the codes and i still get a knock sensor code, and the evap code. I also get a code for a low cell count in the front cats, because of my warpspeed y pipe.

 

They might, but don't take my word on it. My opinion is based on my experiences. I had a KS code and the 0440 code and replaced the KS recently. I still have both codes. Let me know if you fix your problem...