Mamas boy

Hello everyone, I need your help, I promised my mother I would fix her car, its a 2000 Lexus ES 300, but no such luck yet. My OBD pulled the knock sensor codes p0330 bank2, however I replaced both sensors twice and the connector, but the check engine and the trak light came back on with in a few miles, can someone help and provide some solutions that might be causing this, thanks for the help.