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P0440 Evaporative Emission Control System Malfunction. Then can be as simple as a loose gas cap, and can be a vacuum line leak at the tank. First thing I would do is make sure the gas cap was tight, (3 clicks when tightening). Reset the light and see if it comes back on. If so then replace the gas cap if you find no vacuum leaks. If after doing this, it comes back on, then it may be time to visit a professional.
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