Trafic AdBlue Empty Error No Start

Sounds like it. I saw the same thing on a Master van last week. If the output fails, the system thinks the tank is empty and won't let you start. Have you checked the SCR catalyst? A bad sensor there can cause similar issues, but it's less likely with those errors.

Thanks. Is there an easy way to check the SCR catalyst, or do I need special equipment?

You'll need diagnostic gear to properly test the SCR catalyst. It's easier to check the AdBlue injector for crystal build-up. If it's clean, the pump in the tank is probably bad. Based on what you're seeing, I think you need a new AdBlue tank. Take it to a workshop.

Thanks for confirming. I'll take it to a workshop to have the AdBlue tank checked and replaced. The estimated cost is around 250€.