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Codes P0455, P0456, and P0457 on a 2007 Chrysler 300 indicate issues with the evaporative emission control system (EVAP). Specifically, P0455 denotes a large leak, P0456 indicates a small leak, and P0457 points to a loose or missing gas cap. These codes typically suggest a problem with fuel vapor containment, which can lead to increased emissions and might affect fuel efficiency. It's advisable to inspect the gas cap, EVAP hoses, and related components for any signs of wear or damage.

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