Q: Including parts and labor, what is the cost of replacing the serpentine drive belt on a 2009 Subaru forester with 83,000 miles.

If moving the steering wheel while turning the key does not work, then try your extra key. If this does not work, then the ignition key cylinder will need replaced. I recommend having a mechanic, like one from YourMechanic, inspect...

Assuming that it is not an electrical issue (e.g. somehow power is NOT being cut once you release the key from the "start" position) you have a mechanical flaw with the starter. It is hard to say from your description...

You did not indicate if the new gas cap resolved the P0456 trouble code. If it didn't, the appropriate diagnostic is a check engine light diagnostic. With regard to gas caps, if a cap is faulty the best practice is...