Knock Sensor 2 Circuit Low Input (Bank 2). is this something that can be tuned out, but do i need to replace the sensor? just trying to figure out were to start. i need a full tune anyway.

also getting a P1637. Can Link ECM/ABSCM Circuit / Network Malfunction
I have no idea what that is. is it something that i need to be worried about?

 

Don't know about desensitiving/tuning the rear KS, but I'd replace both sensors and harness if one was bad since you have to pull the intake. P1637 is Generator L-Terminal Circuit and has to do with the alternator or exciter wire. Visit gearchatter.com and read through the descriptions/diagnostics for your year.

 

+1 on that