You need a proper code reader for starters. Unless you enjoy working on cars and want to look at as a challenge then put the tape back on!
That being said, now that you know there are problems you will probably want to fix them or it will eat away at you, and if you don't they will probably now see it on your face at the inspections!
Plus the car now knows that you know, so there is that!
Crazy that it passed inspections, or maybe the inspections are only for emissions (not safety) and the CEL is working??