Audi has recently issued a recall for its model-year 2017-18 Audi A3 cabriolets and sedans, because the engine control unit software may misinterpret the flywheel rotation on engine startup as a “knocking” condition, and the adjusted air/fuel mixture may result in an engine stall, and that might increase the risk of a crash.
What you can do
Dealers will fix the problem for free. For more information you can contact Audi at 800-253-2834 or the NHTSA at 888-327-4236.