You can expect a few faults the first time you use OBd11, it seems past faults are stored for reference, even if it is no longer an issue.
If the battery has been low or disconnected at any time, this can bring on minor faults, which need clearing to get a true summary of how the car is running.
Clear the codes and rescan once a week or so, to see if you have a recurring code and the 1-6 rating of importance.
Good luck!