Service engine soon light on 1998 Nissan Sentra

Hi, I my service engine soon light came on and are showing the codes:P0440 and P1448. This just happened.
Can you tell me what these two codes mean.
Thank you for your time.

Asked by for the 1998 Nissan Sentra
Assuming that you have a 1.6 litre engine.

Vehicle Application: 1998 Nissan Sentra 1.6L, Vin A, Eng Des GA16DE

Customer Concern: Trouble codes P0440 and P1448.
Tests/Procedures: 1. Blow through the canister vent control valve with the key off. It should be easy to blow through.

2. With the ignition switch on, ground the Purple/White trace wire. One should not be able to blow through the solenoid at this time.
Potential Causes: Canister Vent Control Valve

Tech Tips: The canister vent control valve is a common failure on this vehicle.
Diagnostic Codes: P0440, P1448
thanks for such a quick response!!
Please e-mail me at swaths3644@mypacks.net
3 answers 2 comments
Common Problems that Trigger the P0440 code:

* Missing Fuel Cap
* Defective or damaged Fuel Cap
* Distorted or damaged Fuel Tank filler neck
* Torn or punctured Evaporative System hose(s)
* Defective Fuel Tank Sending Unit gasket or seal
* Split or damaged Carbon Canister
* Defective Evaporative Vent Valve and/or Evaporative Purge Valve
* Defective or damaged Fuel Tank
* Defective Fuel Tank Pressure Sensor

Number P1448
Type Powertrain - Manufacturer Controlled DTC - Manufacturer Controlled
Description

Evaporative emission (EVAP) canister purge system - vent control valve malfunction
Cause

Wiring, EVAP vent valve, EVAP pressure sensor, hose leak/blockage, EVAP canister contaminated, EVAP vacuum cut valve, ECM
where is the canister vent valve located?