The check engine light is one of the most misunderstood warning signals in any vehicle, and Hyundai models are no exception. When this light illuminates on your dashboard, it could indicate anything from a loose gas cap to a failing oxygen sensor, catalytic converter issues, or a faulty mass airflow sensor. In some Hyundai models, it may also signal problems with the ignition coil or spark plugs. Ignoring this warning can lead to more serious and expensive damage over time. Understanding the most common triggers behind Hyundai's check engine light empowers owners to act quickly and make informed repair decisions.