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What Does This Light on my Dashboard Indicate

My “Check Engine” Light Has Come On, and What Should I Do When It Does? When you start your vehicle, the check engine light comes on momentarily to test the engine/emission control system and bulb. The system is self-diagnostic and the light is a way to communicate trouble. The system is designed to function in a “limp home” mode when trouble occurs and the light comes on – and stays on. However, take your vehicle Auto Service Department right away (or if you are traveling, to the nearest Authorized Service Center).