P0327 troubleshooting help.

I have a 2015 prius 3 with 217000 miles on it. This morning, immediately on startup it threw a P0327 code, knock sensor low voltage.

car runs seemingly fine, good power, mpg normal. I figure, mouse ate a wire probably.

got home from work, pulled the intake off, inspected the wiring, its perfectly fine, no corrosion at all, wires are perfect.

i heard it is crazy rare for the sensor to fail, and i am not dropping $160 on a new one just to see.

are the cheaper ones ok? Ive seen some for $35, but i know toyotas are picky on sensors.

or any ideas why it would be acting up on me?

 

Very informative, thanks.

so i disconnected the harness from the sensor and inspected the connectors, cleaned the pins and sockets even though they looked ok, reconnected it all and drove to work with the check engine light on. Got in my car to go home and the light was off. It has not returned since then, monday i think.
So maybe it was just a poor connection