P0325 and P1491; are they related and will delayed repair hurt the engine or other parts?

Question

1998 Nissan Maxima GLE 3.0L V6, Codes P0325, and P1491; are they related, and will delay repair hurt the engine or other parts?

Answer 1

P0325 knock sensor circuit malfunction,

P01491 secondary switch solenoid circuit malfuction

No,The knock sensor on the Nissan will always come on,it always codes up, so if you want to replace it make it a hobby,you will always be doing it,  P01491 this is the secondary air which on cold start up comes on for a brief moment to help warm up the catalytic so you dont pollute the air, this is just the switch itself or the secondary pump itself.Just satisfy the P01491,repair it when you want unless the check engine light bugs you