P0452 is fuel tank pressure sensor circuit fault. I have never heard of a P0440, but 400 series codes are in the emmissions, i.e., EGR and Evap system. I would try to fix the 452 and see if the 440 goes away with it.
Trouble code P0440 means:Evaporative emission control system malfunction
bad o2 sensor on left bank
P0440 = EVAP Emission Control System Malfunction. The Check Engine light would illuminate and you would fail an emissions test.
Large evaporative emissions vapor leak. Check gas cap and all hoses from the engine to the gas tank.
Trouble code P0440 means:Evaporative emission control system malfunction
Trouble code P0440 means:Evaporative emission control system malfunction
P0442- Evaporator system small leak. P0440- Evaporator system malfunction.
Trouble code P0171 means: Fuel Trim System Lean (Bank 1 Trouble code P0440 means: EVAP System No Flow During Purge
Trouble code P0440 means: EVAP System No Flow During Purge First thing to check is your gas tank cap. The vehicle will give this code if it is faulty or loose.
Trouble code P0440 means: Evaporative Emission System
Trouble code P0440 means: Evaporative Emission System
The code number is P0440 not 1744 see: http://www.obd-codes.com/forums/2669-obd-codes-2001-chevy-cavalier-p0440-evap-code-check-enginehelp.html