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