ok guys, my VX threw some check engine codes today and so i stopped by autozone to find out what codes they were...

ok, so my VX has been throwing this one code for a while but it doesnt seem to affect the motor at all or power so i have procrastinated having it fixed...

P0327- knock sensor

i have no idea what a knock sensor is (besides guessing that it reads engine knock, but i dont have any engine knock so that would make no sense)
is this something that i can fix myself?

ok, secondly, a new code popped up today-
P0161- oxygen sensor, cyl. 1, after the catylitic (sp) converter (thats the info autozone gave me)

i did a search on this and got a thread concerning replacing the O2 sensor, is this all i need to do? or maybe one of the wires just got a little short in it, causing the sensor to fail for a second or two (the light turned off after a few minutes of driving)
i know O2 sensors aren't all that difficult to replace, so if i just need to replace it, thats fine and easy, i can do that myself (if its similar to my integra)

thanks guys