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I’ve heard that a loose gas cap can trigger the “Service Engine Soon” light. Is this true?

April 26, 2017cap engine Gas heard I’ve light Loose Trigger

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I’ve heard that a loose gas cap can trigger the “Service Engine Soon” light. Is this true?

1 Answer

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Yes, it is. If you have a loose or missing gas cap, fumes from your gas tank are escaping into the atmosphere and your computer detects a leak and increased emissions. On some vehicles, you can properly install the gas cap and the light will turn off. (This may take some time, depending on your driving habits. A service technician can confirm the light is on due to a gas cap issue and reset the system at minimal cost.) Other vehicles require the assistance of a service technician to reset the light.