CEL codes

[kgmazda3]

My wife just bought an 08 mazda3 hatchback and two days after driving it CEL came on with code p2405. We called dealer and they agreed to look at/fix it so we dropped car off and the next day they said it was fixed, something about a purge valve , so we get the car back and a couple days go by and again CEL came yet again, this time same p2405 code and an additional code p0446. Any one out there know what these mean and if they are serious enogh to not be driving the car? any info or help is greatly appreciated. Thanks in advance

 

[kgmazda3]

there arent any experts that have some insight for me huh? kind of surprised

 

[flash75]

Both codes EVAP systems codes. P2405: EVAP system leak detection pump sense low input. Information from shop manual.
P0446: Change over valve (COV) (EVAP system leak detection pump) stuck close. Shop manual.

I'm no expert, but your problems may be caused by some loose hoses or in the EVAP system leak detection pump. If you want to try figuring it out try to find
a source for a manual download. The manual is over 3 in thick and will not fit in my scanner.

Clifton