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?