The Diesel Exhaust Fluid (DEF) warning lamp illuminates yellow to warn the driver that the level of DEF is starting to run low.
The Diesel Exhaust Fluid (DEF) warning lamp illuminates yellow to warn the driver that the level of DEF is starting to run low.
The warning lamp also illuminates yellow if the incorrect fluid has been added to the system, or if there is a fault with the system.
The instrument panel also displays a warning message. Follow the on-screen messages, if safe to do so.