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Re: p0449 error code
Welcome to AF!!
This code indicates that the solenoid that controls the evaporative emissions system is malfunctioning. You will need to replace it with another one. Also check the vacuum lines to the solenoid as they may be damaged as that can cause the same problem.
I am not sure where it is located on the Montana but it should not be hard to find. Once it has been changed clear the code and see what happens.
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