how do u replace the knock sensor? Is it a big job? on 2001 Nissan Xterra

"service engine soon" light keep coming on Code reader says "knock sensor"

Asked by for the 2001 Nissan Xterra
And may or may not be the problem!
That was the diagnosis of the repair shop. Thank you for the reply.
Well the code does not mean that the sensor itself is the problem! Possible circuit to the sensor or engine noise the sensor is, well , sensing! However it could be a bad sensor but needs to be checked out first. Everyone assumes that a code points directly at the problem/sensor,, not the case at all.! Now that is when the true diagnostics begin by a qualified mechanic!!
2 more answers , 2 more comments for info
thank you for the tip.
Try YouTube Videos, it will give you a better insight.
Thanks for the answer. I will try that