Why isn't the start-stop system working on my Audi A3?

My Audi A3 has a start-stop system that should save fuel and reduce emissions by automatically turning off the engine when I stop at traffic lights. However, the system doesn't seem to be working. Even when I come to a complete stop, the engine doesn't shut off. What could be causing this issue?

Your start-stop system may not be working due to a faulty battery. Oftentimes, the start-stop system is programmed to not function if the battery is below a certain level of charge. Consider getting your battery checked and replaced if necessary.

Another potential reason for the start-stop system not working could be a faulty sensor or switch. These components are responsible for detecting when the car is at a stop and turning off the engine. Have a mechanic check these parts to see if they need to be replaced.