P0442 Evaporative Emission (EVAP) System Small Leak Detected. The CEL light just turned on in my 2002 4.7. im just curious what the evap emission is, and how easy it is to replace?

 

Start with your gas cap. Make sure it is tight. If it doesn't go off in a couple of days, it is probably the rubber evap hoses. They are prone to dry rotting. If you do a search, you'll see that it is a common problem.

 

sweet, well the o-ring on the cap was torn. easy fix. thanks

 

i'm having the same problem but i'm an 03 ... can you elaborate a bit please?

 

well from the tech at dodge: the gas cap and rubber vent hoses are supposed to seal, if they dont the pressurization change is registered and reads as a leak. so first make sure your gas cap is on good. clear the code and see if it works. if not check the hoses then spend the 15 bucks and get a new gas cap. took me about 3 minutes and the code is gone. for some reason my rubber o-ring around the gas cap was torn a bit.

 

can you be more specific as to which hoses to check ... if i just ignored this would my truck suffer at all?

 

I replaced my gas cap which I got directly from the dodge dealer and still get the errors P0442 & P0455, where are these hoses at? I've had is checked many times only to have my check engine light come on over and over again.

Is it easier to have these hoses replaced doing it myself or what?

 

I could not tell you what each hose is for in trucks these days but I had an '02 dakota with the 3.9 when I ran into some of the same trouble. I had a friend who worked at Auto Zone and he said just check each hose for a cut or something which might be causing a leak. I did what he said and sure enough found two hoses with cuts in them. I replaced them both for under $5 and theengine light went off. In other words, do some detective work and inspect all your hoses.