[ImmaSquashYou]

yes, a scanner, obd2 scan code reader for you to get codes. A KS code might not light up the cel light. It might be a ghost code. You might check for codes and see that there is nothing there. It might not be there because the system is not ready. I usually won't tell people to do this because you are correct that you can check the code yourself with a screwdriver. However, it seems that you are in a special case where you need to make sure that all your systems are up to par and are running. Or, your car just hates you and likes to eat gas