hi there . I have this code p0456

I went and changed every hose down by the canister

went bought a evap canister,gas cap, the purge solenoid was replaced along with leak detective pump. that was done at the shop..

I changed the hoses and evp canister..

well the engine light was gone then 3 days later it came back with a different code. the code is p0455

p0456 is gone but code p0455 is on now..did I miss something ..any ideas

 

Check the over flow pipe that comes off the filler neck for damage.

Also check for any cracked vacuum hoses in the engine compartment.