We’ll also give you a few tips for troubleshooting the culprit that triggered it. How The Light Works. The origins of the CI light actually date back to an earlier automotive design. It is connected to your vehicle’s onboard diagnostic system. This system uses a computer … Drive to a repair shop and ask a technician to pull the code as soon as possible. Then, once you have determined if the issue is serious, you can decide whether you can postpone the necessary repairs . …