Try these tips:
Fuel filler cap, vacuum connection, fuel tank, fuel tank pressure sensor, evaporator bypass solenoid, evaporator two way valve, evaporator control canister vent shut valve, evaporator control canister and evaporator 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 are lucky it will be simply a replacement gas cap. If it is more than that, you will 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 want to be sure the right part is being replaced because some of the components listed are pricey and you do not 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.
Tuesday, May 1st, 2007 AT 7:45 AM