PO440 Possible Causes:
Charcoal canister is loaded with fuel or moisture
Fuel filler cap is loose, cross-threaded, damaged or wrong part
Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
Fuel tank pressure sensor is damaged, disconnected or it failed
Fuel tank vapor line(s) is clogged, damaged or disconnected
Purge valve vapor line is clogged, damaged, or disconnected
Purge or vent solenoid power circuit is open (check the fuse)
PCM has failed
PO443:
Purge solenoid control circuit is open or shorted to ground
Purge solenoid control circuit is shorted to system power (B+)
Purge solenoid power circuit is open (test the ENG1 fuse)
Purge solenoid is damaged or has failed
PCM has failed
PO449:
Sames as PO443.
Hope this helps.
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