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The gas cap is loose, tighten it and reset the light by taking out fuse number 13 on the passenger side for 30 seconds and putting it back. If the light comes back after a few miles try using higher grade gasoline like 89. Do the reset again. If after 5 cycles the light is still coming on take it to a hoda dealer or some good shop that can diagnose the issue it could be any component related to the gas tank that might be failing like a valve or vent or the cap. I would start with the cap as it's easy to replace and you can do it on your own. Oh and get the cap from the dealer that matches the OEM one.

Good Luck!

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Q: What can be wrong when a P1456 check engine light on a 2001 Honda Accord?
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