Knock sensor N62

[four.8is]

hey guys, the last two weeks I had the CEL illuminate intermittently , 2 days on, 2 days off type of thing...

Pulled out DIS and checked the code. P1327: Knock sensor signal 2.....does that mean bank 2, driver's side? check out pic below..

If im gonna go through the trouble of removing the intake manifold, should I replace both sensors?

New intake gaskets for sure, but how about injectors o-rings? are they mandatory to replace?...btw, ive got 145k miles.

Any other tips from others that have done the job before?

Thanks!