With Driver Airbag Deployment:

WARNING: This page does not describe the selected car, but rather 19 other vehicles, including the 2017 Audi S5, 2017 Audi A5 Quattro, 2016 Audi S5, 2016 Audi A5 Quattro, and 2015 Audi S5. However, it is still accessible from the selected car via links, so may be relevant.

Steering wheel: Remove the steering wheel and place it with the steering wheel rim on a flat surface. The entire steering wheel rim must rest on the surface. Otherwise the steering wheel should be replaced.
Check steering wheel for smoke residue. If smoke residue is present, replace the steering wheel.