BUICK REGAL P CODES (POWERTRAIN)

I Have My Car Listed Above, Is At The Shop. This Is The Code That Came Up. I Have 4 Codes Actually, But This Is One Of Them. I Was Told...

I Have A Code That Comes Up As Po108 Manifold Absolute Pressure/baro Sensor High Input Changed Mass Air Flow Sensor And The Code Came Up.

P0697 I'll Replace The Mass Air Flow Sensor I Also Replaced All The Relays And New Air Filter Install I Also Did A Hard Reset By...