A flashing check engine light is generally considered more severe than a solid check engine light. Here's why: - Flashing Check Engine Light: When the check engine light is flashing, it indicates a significant issue that requires immediate attention. It often signifies a severe engine misfire or another critical problem that can potentially cause damage to the engine or emissions system if not addressed promptly. Driving with a flashing check engine light is not recommended, as it can lead to further damage and potentially leave you stranded on the road. - Solid Check Engine Light: A solid check engine light indicates a problem within the engine or emissions system, but it is generally not as urgent as a flashing light. While a solid light should not be ignored, it signifies a less severe issue that may still require attention. It is important to have the cause of the solid check engine light diagnosed and repaired in a timely manner to prevent any potential deterioration of performance or further damage to the vehicle.