![]() ![]() There are many things that can cause the P0456 trouble code to trigger in your Mercury Grand Marquis. Grand Marquis P0456 Trouble Code Causes + Diagnosis But it won’t affect the way the engine itself runs. If fuel vapor is leaking from the system, you may smell it faintly while driving your Grand Marquis. The EVAP system deals directly with fuel vapor. If there are, they may help you pinpoint where the leak is coming from.
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