Same light and engine here; mixture too lean is typical.
Dealership will probably go after the lambda and EGR. There are also some reported issues with ECU if you are at Audi dealership. A few in here has solved the issue by replacing the injectors
The codes say a bad egr valve. But i have a new egr valve since two weeks ago. My local garage will put a new egr valve once again and see what happens.