Which one should i start with first?

p0400 egr valve
p0150 o2 sensor bank2 sensor 1
p0325 Knock sensor
p0130 o2 sensor

 

you can clean your egr i would start with the o2 sensors depending on how the knock sensor failed. hows the car run

 

O2's and EGR.
See if the ks code returns after the above 2 are fixed.

 

The car runs fine, or seems to anyway, no knocking hesitation or anything of that nature, it just sat for a year only being started with minimal driving once a month probably.... i will start with the O2s and let yall know.....thanks for the help!!