Have yet to see if I've full rpm again haven't gotten around to fitting the recirculation pipe from dump valve but the code is there even before I start the car and will not clear so it's likely some sort of wiring issueYou are looking at this in reverse..
the knock sensor will not cause a lean situation.
The knock sensor when it senses noise will cause the car to run in limp mode and from memory limits the rpm.
So if you have been running lean, which I would of thought is unlikely at idle, if you have any form of Det that the knock sensor picks up it will put the car into limp mode..
What happens with knock sensor in plugged?
I unplugged it a few days back to see what codes come up and it goes from p0327 low input plugged in to p0328 high input when plugged out.