MAF sensor and codes

I was trying to clean the throttle body the other day and I forgot to reconnect the MAF sensor. I got two codes 0100 (MAF sensor, which I expected) and 0325 (knock sensor, which I didn't expect). Does anyone know if both codes should be present from doing that? I noticed another member made a post about disconnecting the MAF, but his last active was in 2001 so I doubt he is still a member. Any help would be appreciated.