It really depends on what codes you get. Actually, if everything is working properly, you should only get the "PASS" code (111) when you pull the active and stored codes (KOEO). If there was a problem that has been corrected, you may get PASS for active and a list of stored codes if the memory wasn't cleared. Or, there may be stored codes for problems that still exist but are not showing as active when you run the test. If you're not sure, the best thing to do is write down the codes you see now, clear the code memory, drive the car for a while (if it will run) and pull the codes again.
If you have active codes (these show up in the first sequence), there is definitely a problem.
What active and stored codes did you get?