Knock Sensor-->86 type 44q

[Houston Texas]

Hello all, according to my ECU, I have a knock sensor that is needing
replacement or has a broken wire.  How ever it may be, does anyone know
where this is located?  I use 93 and on occasion 89 octane.  I hope
this(89) didn't damage anything.  I guess it could also be from the 3ft
of water I drove through, since that's when the light first came on.
Sorry AG's, I won't do it again.  I promise, I really do.