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Can a gas cap cause a check engine light?

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Many people don't know this, but a loose, cracked, or faulty gas cap can cause fuel to evaporate, thus cuing your check engine light. So first things first, pull over (as soon as it's safe) and make sure your gas cap is on tight. read more

Loose gas caps are one of the most common reasons the “CHECK ENGINE” light comes on. If CarMD tells you a loose gas cap is the culprit, tighten it until you hear it “click.” Then be patient. It may take a few trips around the block, or even a few separate starts, before the “CHECK ENGINE” light re-sets. If the cap remains loose, replace it. read more

Pull over, retighten it, and take a look at the cap to see if it has any cracks in it. Continue driving and see if the check engine light turns off. Alternately, you can purchase a gas cap for about $3 at an auto parts store. All you need to do is take the old one off and screw on the new one. read more

1. It might just be your gas cap. Many people don’t know this, but a loose, cracked, or faulty gas cap can cause fuel to evaporate, thus cuing your check engine light. So first things first, pull over (as soon as it’s safe) and make sure your gas cap is on tight. read more

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