04 Kia amanti.
What’s this plugged in near the mass airflow sensor? Is this normal and supposed to be exposed like that?
Well, you could find a diagram that tells you exactly what this part is.Google is your best friend 
No experience w/that particular model but stuff near the mass airflow sensor is usually
- MAF sensor electrical plug
- Intake Air Temperature electrical plug (IAC)
- Throttle position actuator and sensor electrical plugs.
- EGR & other emissions related valves/ports, for the canister purge function for example
That is the PCV breather hose. Try to push the brass connector farther into the air tube.
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I would say no. it could give you a lean code like PO171
have you checked your gas cap. a faulty seal on your gas cap could cause the PO456 code
P0456 Kia — Ricks Free Auto Repair Advice Ricks Free Auto Repair Advice | Automotive Repair Tips and How-To
Yes I changed the gas cap and sprayed around for vaccum leaks, no idea. I’ve had p0456, p0442, and p0431 for a couple years now @weekend-warrior
I’d run a hair dryer at the rubber tube where the brass part pushes in, get the tube really hot to the touch, then wear a leather or thick cloth glove and reach in and shove the brass part all the way in.