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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

Honda Civic, Check Engine Code # 1456

Q: I retrieved code 1456 after the check engine light came on my Honda Civic. What part needs to be replaced to fix this problem?

A: I can't tell you specifically what part, but I can tell you what parts to check. Honda lists the following as possible causes for a DTC #P1456. Here we go. Fuel filler cap, vacuum connection, fuel tank, fuel tank pressure sensor, evaporative bypass solenoid, evaporative two way valve, evaporative control canister vent shut valve, evaporative control canister and evaporative purge control solenoid. You have to understand that computer codes rarely define the exact component that has failed. All the computer code tells you is that a system that could have one component or many is not operating within the acceptable parameters of the computer's program. Code P1456 means that your vehicle is failing to contain/hold the gas vapors in the gas tank. Retrieving the code in your case was the easy part. If you're lucky it will be simply a replacement gas cap. If it is more than that, you'll need to have the problem diagnosed. Because of the complexity of the system, it may take a couple of hours and some specialized equipment to diagnose the cause. You'll want to be sure the right part is being replaced because some of the components listed are pricey and you don't want to be replacing them on a guess. It would be great if the computer could make a little red flag pop up from the defective component. But then I would have less gray hair and be out a job if that were the case.

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