Small leak in the evap system. You need to do a smoke test
code PO442 Evap sys leak There could bethe gas cap or a crack in the plastic of your charcoal canister. A hose could be pulled off, or broken, or split, or removed by a mechanic and never put back on. The pressure sender could be broken and never signalling the ECU. The solenoid could be broken and never performing the EVAP purge. Any of the wires to the solenoid or the sensor could be broken, shorted, or unhooked. they make a smoke tester to find small leaks in evap system most dealers have them cost about$100 to diag hope this helps
Most cars have a plug located inside the vehicle under the dashboard on either the right or left said of the steering wheel column. The code tester connecter will depend on the year of the vehicle.
The hookup is usually under the dashbord close to the steering column. If it is not in plain view, it will be under a removable panel approximately 4 or 5 inches by 6 or 8 inches,
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P0455 - EVAP CONTROL SYSTEM LEAK DETECTED ( NO PURGE FLOW OR LARGE LEAK ) possible causes : damaged or missing fuel filler cap / cap not installed correctly after-market EVAP hardware ( such as a fuel filler cap ) not conforming to Ford specs blockages or restrictions in fuel vapor hoses canister vent solenoid stuck open loose fuel vapor hose / tube connections to EVAP system components disconnected or cracked fuel EVAP canister tube , EVAP canister purge outlet tube , or EVAP return tube damaged EVAP canister mechanically inoperative FUEL TANK PRESSURE ( FTP ) SENSOR ( CHECK FOR VACUUM NOISE / FUEL ODOR IN ENGINE COMPARTMENT OR NEAR EVAP CANISTER + FUEL TANK )
P0456 = Evaporative Emissions System - Small leak detected. There could be a small leak the size of a pin hole somewhere in the EVAP system. Finding this leak on your own can be difficult and almost impossible without the use of a smoke machine.A good place to start would be to spray a little carb cleaner on a shop rag and wipe down the fuel filler neck seal area with a clean lint free shop rag and replace the gas cap with a new one. If that doesn't do the trick, eye ball the EVAP system carefully front to back looking for trouble spots. If that doesn't help you will need to have a garage do a smoke test on the EVAP system. There are some videos on You Tube where people have built there own home made smoke machines to test automotive EVAP systems. You will need to understand how the EVAP system works to properly test it for leaks with a smoke machine. Good luck.
Evap pump
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First use a scan tool to check for the trouble code, I assume you have already done this. The most common codes are for leaks, gas caps being left off is the main culprit. Make sure the gas cap seal is in good shape and tight. Next inspect all the EVAP hoses from the engine to the fuel tank for cracks or being disconnected. If the problem was not found it may be time for the repair shop. EVAP smoke testing can be done to pinpoint the evaporative leak. There's a tech article that goes into detail when using a smoke machine to diagnose these leaks, search Google "Denlors Evap leak detection".
A gas hookup will have fittings for a gas line, they should be clearly visible. In an electric hookup there will be an electrical plug, but no gas lines showing.