Category: loose gas cap cause a check engine light

Why does a loose gas cap cause a check engine light? — Ricks Free Auto Repair Advice Ricks Free Auto Repair Advice

How does a loose gas cap cause a check engine light? Vehicles are equipped with an evaporative emissions system that captures fuel vapors as you fill your tank. Venting fuel vapors into the air causes air pollution and smog. How does the evaporative emissions system work? As you fill your tank with fuel, vapor pressure […]

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