MY10

I have a CLS 500 2012, just recently I am now facing an issue that has reduced power, car does not give its full power so instead of the 408bhp the car comes with I feel like I have about 250.
also upon cold starts and sometimes on warm starts the car has a rattle sound for a couple seconds then goes, my mechanic said when I first told them about the rattle is that it is a small issue, but now this turbo issue has come, starting to think they are related. Any thoughts?

here are the fault codes coming up, let me know what I can do to get my car back to normal power