before going to a dealer, clear the codes and see if they come back... you already wrote the codes down, so you should be able to tell the mech what you have. on the come back (if there will be a comeback of the codes) you might get more, less or the same number of codes... this may give more information about the engine's condition...

and one more thing - the car is out of warranty - taking it to the dealer is a financial suicide... dealers do not repair things, they replace modules, a lot of times they misdiagnose the issue and start throwing parts into the car until it fixes itself... well, you guessed right, at your expense... ask me and half of the people on this forum, how we know... lol

see if there is a good indy in your area, take the car to him...