What are codes P0440 and P1665? 1998 buick century

Question

My check engine light is on I get codes P0440 and P1665 What do the code mean so I can repair and clear the codes thanks

Answer 1

P0440 EVAP system

P1665 EVAP solenoid control circuit

When you code P0440 check the fuel cap. If the seal show wear or crack this is the cause of the code.  This code condition the evap solenoid which is located on the charcoal canister may need a replacement., before doing any part replacement check the condition of the emission hose where the vent solenoid is at any emission hose on the charcoal canister that connects to the evap vent solenoid that is crack  or rupture is the cause of the code. beside being the vent solenoid.