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I keep getting this 0440 mil code set when the check engine light comes on. It is supposed to mean a general failure of the EVAC system. What does that really mean? I have several 02 Treps, and they all would occasionally get that code. I previously thought it might be an issue related to seasonal gasoline formulations, but this code doesn't want to go away on its own, like they previouslyrics have.
 

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I've had the code and a P0456 code forever, EVAP pump is leaking.

I drove for years with those codes. Slightly - slightly less gas mileage.
 
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