knock sensor

[aquickfive0]

service engine soon light coming on

reads low input to knock sensor 1 bank1


whats it mean and what can it be

i replaced both of them and still reads that on computer when read serive engine codes

2002 ws6
sts turbo
lq9 heads
42 lb injectors
comp cam
and so on

[2001NBMZ28]

Dunno. Look up the code at gearchatter.com and see what it says, might find the answer there.