Dealing again with your evaporative system which is designed to avoid leakage of gas vapor to the atmosphere, this P0455 code expands this problem further. As you will know, this is accomplish by having a purge solenoid which allows the flow of gas vapor between the tank, fuel canister and throttle body. When this solenoid is defective, the flow could be disrupted and prevent the circulation of gas vapors in the system. Furthermore, the most common problem here is leakage which can occur at the solenoid, canister, vacuum hoses and especially coming from a loose gas tank cap. Such leakage will allow hydro carbon gas like your fuel gas vapor to escape to the atmosphere.

Any leakage in the gas flow will be detected by the computer since it controls the purge solenoid by getting the fuel mixture signal from oxygen sensor. When this happens, this code will be flashed in the vehicle dash panel. To correct, always go to the gas cap first and make sure it has good sealing gasket and installed tight. Next, visually inspect for vacuum leakage by checking for ruptured vacuum hoses, plug pcv valves or cracked canister.

Tip:

Any vacuum leakage can be seen by signs of wetness in the area involved. If a vacuum hose is leaking, the defective area should be wet with gas or even a smell of gas.

Once this vacuum test is exhausted, the best way to find the leak is to have it checked by a smoke machine used by garages to detect miniature gas leak not visible to the human eye.

Thanks!

This entry was posted on Friday, March 21st, 2008 at 2:04 pm and is filed under Check Engine Light FIXES. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.