Your check engine light, sometimes called the malfunction indicator lamp (MIL), means that your car is experiencing an engine problem. Depending on the vehicle, the warning could also include words such as "Check" or "Service Engine.". Check Engine Lights (CELs) are triggered when one of the engine's systems is experiencing an issue.. There are many reasons (both minor and major) why the check engine light illuminates on a Mazda 3. We have compiled a list of some of the most common causes: Loose fuel cap: Before you start looking through all sorts of vehicle components, first check out the gas cap. A loose fuel cap can sometimes cause the check engine light to turn on.

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Common Causes of a Check Engine Light. Loose or Damaged Gas Cap: A loose or damaged gas cap is one of the most common reasons for the check engine light to illuminate. A loose cap can allow fuel vapors to escape, leading to an emissions system issue. Faulty Oxygen Sensor: The oxygen sensor measures the amount of oxygen in the exhaust gases and.. Driving with a flashing check engine light can severely damage a car's engine and other components. Why do dashboard light colors matter? You should also pay attention to the color of the check engine or other dashboard warning lights as they indicate the urgency of the issue: The red color is more serious and typically indicates critical.