It appears that the hose to the carbon canister is either disconnected or has a hole in it. It won't hurt your car to drive it this way. If you are really concerned about it, replace the carbon canister and the connecting hose and forget about it for another 15 years or so.
SOURCE: P0442-Evaporator emission control system leak(small
The purge solenoid is by the engine and is connected to the vacuum system. Check the vacuum lines going to this and the lines that may be connected to the vacuum port it comes from. Check for seals on the solenoid if it is directly in the intake manifold. Other things to check are the lines (plastic) that go to the charcoal canister and fuel tank. If the light has been on for a while I would start with the pugre solenoid. If you have a vacuum leak there it would go from small to gross.
Small leaks are checked by the ECM constantly, gross leaks are some that has broke/cracked.
SOURCE: 2003 mazda protege p0455 code
Look at the gas tank filler cap. Make sure the seal in the cap is good. If it is cracked it may be leaking air into the system. Simply replacing the cap usually fixes this problem
P0305....Cylinder 5 Misfire Detected
P0442....Evaporative Emission Control System Leak Detected (small leak)
P0455....Evaporative Emission Control System Leak Detected (gross leak)
P0455....Evaporative Emission Control System Leak Detected (gross leak)
P0138....O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
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