How do fix 2003 dodge neon with P0440 and P0441 trouble codes?

Answer 1

you have a small evaporative system leak.First ,replace the gas cap,if this does't clear your MIL, then comes the hard part.yo have tocheck every emission hose from the gas tank filler tube to the canister.These are sometimes very small air leaks, coming from worn hoses,brittle and fragile.Before you do any of thi s you must first jack up the car ,Slide under it.you'll even have to check the canister it's self ,and the Purge vale solenoid.If you can detectnothing(no Air coming from any of the hoses), And you still light up after you replace vthe Gas Cap,Take your Neon to a shop so thatey can pressurize theSystem with smoke where the smoke exits, marks theleak, problem solved!