Ad Blue has been introduced on certain diesel vehicles to help the DPF (Diesel Particulate Filter) function properly. Leave this tank empty and your engine will immediately go into downgrade mode. To help you keep track of your fleet, Fleetee has set up an option that lets you monitor this indicator.
This option can be activated or deactivated for each vehicle. It will also be visible on Fleetee Check during entry and exit inspections.
Here's how to get there:
![[Use Fleetee ] - Option Ad Blue](https://www.fleetee.io/hs-fs/hubfs/1.%20Blog/FAQ/%5BUtiliser%20Fleetee%20%5D%20-%20Option%20Ad%20Blue.jpg?width=910&height=546&name=%5BUtiliser%20Fleetee%20%5D%20-%20Option%20Ad%20Blue.jpg)
![[Use Fleetee] - Loption Ad Blue](https://www.fleetee.io/hs-fs/hubfs/1.%20Blog/FAQ/%5BUtiliser%20Fleetee%5D%20-%20Loption%20Ad%20Blue.jpg?width=910&height=546&name=%5BUtiliser%20Fleetee%5D%20-%20Loption%20Ad%20Blue.jpg)
Don't forget to save once you've chosen your option.
Here's what you'll see on Fleetee Check during your inspection.
![[Using Fleetee] - Public and internal comments](https://www.fleetee.io/hs-fs/hubfs/1.%20Blog/FAQ/%5BUtiliser%20Fleetee%5D%20-%20Les%20commentaires%20publics%20ou%20internes.jpg?width=910&height=546&name=%5BUtiliser%20Fleetee%5D%20-%20Les%20commentaires%20publics%20ou%20internes.jpg)
If you have any questions or need help with Fleetee, contact our support team, but don't forget to subscribe to our FAQ blog so you don't miss out on any of our tips, advice or news.
And so that the Fleetee application no longer holds any secrets for you, download the user guide:
