so i got a p0332 code on my car, and i went to the dealer to get the knock sensors so i can replace them....i gave them the vin number...and they are telling me that there is two types...and cannot tell by vin number which ones i've got....

whats the diff between the two, and should i just get the ones they have in stock?????

also, what kind of benefits do i get by replacing the knock sensors?????will the car run any better???what are their purpose?????