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Code P1456 means:EVAP Emission Control System Leak Detected (Fuel Tank System) Most likely causes 1- Loose fuel cap, 2- Vapor canister saturated 3-failed vent solenoid 4-failed purge solenoid This just happened to me an hour ago, on a Sunday, I am hoping that it is the Loose Fuel cap! That happened to me in my Mazada protege but it waited until quarter of a tank, you have to take it into the dealer, they are the only ones that can reset it. I just filled my Honda up for the first time since I owned it and it is still on F.

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Q: What is trouble code 1456 on a Honda?
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