Why does my Audi A2 struggle to start when it's hot outside?

My Audi A2 always seems to have trouble starting on hot days, but it starts up just fine in cooler weather. What could be causing this issue and how can I fix it?

It sounds like your car may have an issue with vapor lock in the fuel system. This can occur when the fuel in the system becomes too hot and turns into vapor, preventing the car from starting. To fix this, try parking in a shaded area or use a fuel additive to lower the temperature at which the fuel evaporates.