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When you replace the gas cap on a 2005 Freestar with a locking cap, the vehicle's onboard diagnostic system may detect a difference in pressure or vapor seal characteristics. If the new cap is not sealing properly or is incompatible, it can trigger the check engine and emissions lights. Additionally, if the locking mechanism interferes with the cap's fit or seal, it may cause a vacuum leak in the fuel system, prompting these warning lights. It's essential to ensure the new gas cap is the correct type and fits securely.

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2mo ago

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