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'02 300m error code 440 and 442

Hi all, I'm new to the forum, and have a question. I have an '02 300M that spiratically flashes the check engine light with a code of 440, which has to do with the EVAP Emissions Control system malfuction and a code 441 which is EVAP Emissions Control SLystem Purge flow fault. Does anyone have an idea what these mean? Is there a sensor that might produce these codes if it were "bad"? I might go 2 or 3 weeks before it happens, but usually just clear the code and go on. Any help will be appreciated.

RE: '02 300m error code 440 and 442

leak in lines or hoses that is what the 440 is 441 low vac to the purge sol basicly look for rubber hoses that are cracked