Just got my 99 LX two months ago; has 138K, no upgrades just a every day commuter. Anyhow, i got a CEL the other day. pulled the code and it read P1456. need direction on getting it fixed. thanks

 

welcome to the forum ,first try these ,make sure the cap is tight which is the simpilest then if thats not it.
Try these tips:

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. Good luck,Bobby

 

After doing a little research, everyone seemed to point at the gas cap. So, i cleared the code and changed the gas cap out with a new one. i guess i will see over the next few days if the code comes back or not.