SOURCE: Car won't start after filling up the gas tank.
Just helped a friend fix this exact same issue on his 2004 hyundai santa fe. Replaced the purge control valve - a $39 part, even from the dealer. Had to get our hands dirty, but it took literally one single hour to replace the part. Filled it up immediately afterward and no more starting problems. Part is located directly behind the manifold - top, rear of the engine compartment - just between the engine
SOURCE: how to change a headlight bulb in a saturn aura?
Access to change the headlamp bulbs is through the wheel well. The recommended method is to remove the front tire and then the plastic inner fender liner. Once removed, you'll have easy (more or less) access to the rear of the headlamp housing.
SOURCE: How do you change the headlight bulbs in a 2007
Your not going to like this but the head lamp will have to be removed to replace the bulb.
There will be three screws/bolts to remove then lift up ward and pull gentle out and disconnect the headlamp wiring replace bulbs do not touch the clear lens after installing bulbs set headlamp back in and refasten light see diagram below for fastening points 
SOURCE: 2007 saturn aura, engine service code P0442, with
2carpros has this to say about Po442
A code P0442 most likely means one or more of the following has happened:
•A loose or improperly affixed gas cap
•A non-conforming gas cap (i.e. not factory/original brand)
•A small leak/hole in a fuel vapor hose/tube
•Other small leak in EVAP system
•Faulty vent o-ring seal
Possible Solutions With a P0442, the most common repair is to:
•Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
•Otherwise, replace the gas cap, or
•Inspect the EVAP system for cuts/holes in tubes/hoses
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