This refers to the Emission Control System leak detected ,fuel tank system so if you can get under vehicle safely have a look to see if there is a fuel leak but i would expect it would be more likely on the breather side of the system so a repair shop would be the best option
Testimonial: "I also had a P0420 code along with the P1456 as it turned out the Cat Converter was completely closed up, along with ignition control module. Everything is okay now."
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