How do I troubleshoot the start-stop system on an Audi A7?

I have an Audi A7 with a start-stop system that doesn't seem to be working properly. The engine turns off when I come to a stop, but sometimes it doesn't start back up when I release the brake. What could be causing this issue?

The start-stop system in Audi A7s is designed to improve fuel efficiency by automatically turning off the engine when the car is at a complete stop. However, this system can sometimes malfunction and cause issues like the one you are experiencing. The first thing to check is the battery. If it is weak or old, it may not have enough power to restart the engine. Try replacing the battery and see if that solves the problem.

Another possible cause for the start-stop system not working is a faulty starter motor. The starter motor is responsible for starting the engine and if it is not functioning properly, it may not be able to restart the engine after it shuts off. Have a mechanic inspect the starter motor and replace it if necessary.