Nissan Repair: OBDII code reset, flow heat, emission test

Question
I have replaced the knock sensor and O2 sensor based on my OBDII reader,  I then cleared the codes and the engine light we away.  However, when I went for an emission test, there were quite a few system that came not ready (Cat conv, Evap Cntl Sys, EGR flow, Heat Cat).  What do I need to do, the OBD does not read any fault codes.

Answer
Sam,

You have to drive the car for a couple of days for the car to read that it has not been rest recently.  If you wait and go back the next day or two you should be fine.  The computer rats you out to the smog guy if you reset the code and then take it down.