I took my 1999 honda accord to autozone again and these are the code They gave me.
p1457, and p0420. I was hoping that somebody could please tell me what these codes mean and what i could do to fix these problems.

 

1457 is an evap pressure issue(possibly evap cannister) I will find out for sure what it specifically is. P0420 is catalyst deterioration. You need a catalytic converter.

 

P01457 is EVAP canister vent valve. You will need to replace it.

 

I know you guys had this problem awhile ago, but I also have a 1999 4cyl with a p1457 code. I was wondering how much should I expect to pay for an evap cannister vent valve and how difficult is it to change?
Any suggestions as to the best place to buy or mechanical tips would be helpful
Thanks