RPM Up & Down

I put my car on Park and the RPM started going up and down on its on and I could also hear my engine noise. It was strange. BTW It 2008 B6 2.0T @ 54K.

After few hours, I turned on my car again and I got Engine Check light. I took it to Close by AutoZone and they gave me two codes P0171 and P0507. They said its oxygen sensor or mass Air Flow Sensor.
Tomorrow morning, I am going to take it to the Dealership so they can check it out. But before I do that and before they take away all my money on service, is there something I can do to fix the issues by myself.